Merc vs BMW vs VAG reliability - Razzy

When it comes to reliability of the CR units - who's is best?

The engines in question are Merc's 2.2D, BMW's 2.0D and VAG's 2.0D

I know VAG and Mercedes both had issues with their injectors- but that seems to have been fixed, the only issue I can see with the BMW engine is the tioming chain issue.

I want to purchase a car which will be 3 years old. I want to keep it for 5-6 years if possible so need the most reliable diesel engine. I am aware of VAG's PD engines but the rest of the car will be too old so it's a no go area really.

Another car I would consider would be the Accord with the 2.2 IDTEC but have heard about some DPF issues with these, and the economy seems to be poor

Merc vs BMW vs VAG reliability - daveyjp

Type of use is more important than the badge on the bonnet - diesels thrive on mileage. Wth anything diesel three years old what is key is full service history to ensure oil changes have been done regularly using the correct specification of oil.

Rack up the miles and all of them will be very reliable - I have been in Merc and VAG taxis with hundreds of thousands of miles on them and drivers report very few engine related issues.

What modern diesels don't like are infrequent short trips.

Merc vs BMW vs VAG reliability - RobJP

I'll say this : the 'official' oil change intervals for some of these cars are far too long, and are designed or the fleet market, to keep costs down. It's only when cars are a few years old that problems generally start to occur.

BMW (and I'm not knocking BMWs here, I own one) are one of the culprits. The official oil change interval comes in at about 18k miles. As I own my car, I have an oil change carried out half-way through that, at a 9k interval. The service is recorded and goes in the book, but I tell the dealer NOT to reset the service indicator. That way, all the other time/distance based items are carried out as standard.

BMW did have some manufacturing problems with timing chains too - diesels from 2007-2009 seem to have had a bad batch of chains, and, when added to an extended oil change interval, it was a bit of a nightmare for them, in terms of bad publicity.

Merc vs BMW vs VAG reliability - dieselnut

I can only tell you about the VW engine which has proved to be a very reliable unit, been in use since 2008.

It was the older 2l PD engines that had the injector problems amongst other things. Definately steer clear of that one.

I would wholeheartedly agree with Rob, change the oil at least once a year or 9k.

My VW CR has done 173k, nothing has failed. It had the 18k services until I bought it at 156k & is still on the original clutch/ DMF, touch wood.

Always return over 60mpg on a run keeping to speed limits.

Merc vs BMW vs VAG reliability - cocorico

dieselnut,

Is your car 1.6TDI CR or 2.0TDI CR ?

My car has Skoda 1.6TDI CR(I believe this is a standard engine across VAG ?)

It has just passed 60k miles and it has been serviced according to Skoda Service Schedule(Variable Service every 18k).

The car will be service every 10k since its 3rd year.

I am trying to find out long term reliability of this engine. But I can’t find any info.

Merc vs BMW vs VAG reliability - Razzy

According to a few taxis around here, who have the 1.6d in the Seat Toledo/Skoda Rapid, it's not a robust engine.

Tends to give issues past 90k apparantly.

They have good things to say about the 2.0 CR VAG engine, but say the engine is more reliable than the rest of the car. Electrics seem to be the main issue

Merc vs BMW vs VAG reliability - cws

Can only speak for MB - their latest 2.2L diesel (actually 2.143cc) is the OM651 engine and after a few teething issues when it was introduced in 2008 (concerning the injectors), the engine seems to be proving robust. If you want a car 3year car old then all the injector issues were long since solved by that time. Economy is up compared to the engine it replaced, but some say it sounds a little more gruff compared to the previous model.

The 200 CDI is a single turbo engine, whereas both the 220 and 250CDI engines are twin-turbo.

All of them have DPFs fitted as standard, so as above, just think about what style of driving you'll be doing as to whether you actually need/want a diesel. MB's don't seem to suffer with DPF issues as much as some other brands, and when issues do occur it's usually as a result of DPF warning lights on the dash being ignored!

MB have also gone back to sensible oil change intervals of around 10K, as far I know.

Edited by cws on 06/02/2015 at 15:22

Merc vs BMW vs VAG reliability - csgmart

MB have also gone back to sensible oil change intervals of around 10K, as far I know.

On my 2012 SLK diesel 250 the oil change interval is 15,500.

If I was going to keep the car beyond 3 years I probably would have changed the oil and filter at half that mileage, but as it will go back to MB at the end of the PCP it didn't seem worth it.

It will be a good car to buy second hand as I only ever use it for long (50 mile + ) trips and always let the engine fully warm up (10 miles) before giving it any beans. I'm not afraid to rev it occassionally but it usually sits around 1,750 - 2,000 RPM for a nice relaxed cruise at 60 to 70mph.

It is a little 'gruff' sounding but it suits the SLK. In another car it would not seem MB 'like'

Merc vs BMW vs VAG reliability - dieselnut

cocorico

In answer to your question, mine is 2 litre CR.

I don't think the 1;6 is as reliable, seem to a few problems with the EGR & cooler & understand these arn't the easiest to change.

Merc vs BMW vs VAG reliability - Bianconeri
I had a Skoda with the 2.0 CR diesel in 2011-12. It was, frankly, a noisy, thirsty heap of junk. In the 15,000 miles I ran it for it needed two diesel pumps, two sets of injectors and consumed a litre of oil every 700 miles or so. It never cracked 40mpg and was just a miserable experience.

No, it hadn't been mis fuelled as I ran it from new.

We don't run VAG cars anymore, personally or through our company.
Merc vs BMW vs VAG reliability - bankside

Currently running a 56 Reg BMW 320D Touring. Bought second-hand about 6 years ago from BMW dealer in Galsgow

Just completeted 101000 miles.

Oil and filters changed about every 6 months / 9000 miles. Serviced by BMW dealer in Perth and intermediate oil changes at excellent local grage.

No mechanical problems. Two expensive, electrical problems in last 18 months.

Used mostly for long, motorway/dual-carriageway journeys from Perthshire to Darlington, Nottingham, Bala, Manchester, Cardiff, Lee Valley, Newbury. Sometimes loaded with 4/5 people plus kayaks and kit.

Still returning at least 50mpg despite / because of some relatively high-speed runs.

Delighted with vehicle. Wish I had bought scotch-guard finish for the seats.

Merc vs BMW vs VAG reliability - daveyK_UK

I would go for a merc or BMW over a VAG.

VAG quality is woefully lacking across the range.

Merc vs BMW vs VAG reliability - Bladerrw

I would go for a merc or BMW over a VAG.

VAG quality is woefully lacking across the range.

Pathetic

Merc vs BMW vs VAG reliability - balleballe

VAG can't be that bad as most taxis around here seem to be VAG cars in some way, shape or form.

What I don't understand is why anyone would buy an Audi when it's essentially a Skoda/Seat with a 'softer dash'. Same mechanicals underneath due to the MQB platform. I suppose it has something to do with the 'prestige' badge.

Edited by balleballe on 07/02/2015 at 06:25

Merc vs BMW vs VAG reliability - RT

What I don't understand is why anyone would buy an Audi when it's essentially a Skoda/Seat with a 'softer dash'. Same mechanicals underneath due to the MQB platform. I suppose it has something to do with the 'prestige' badge.

So why buy a Mercedes-Benz when SsangYong, Chrysler and Renault share their platforms ?

Merc vs BMW vs VAG reliability - Razzy

What I don't understand is why anyone would buy an Audi when it's essentially a Skoda/Seat with a 'softer dash'. Same mechanicals underneath due to the MQB platform. I suppose it has something to do with the 'prestige' badge.

So why buy a Mercedes-Benz when SsangYong, Chrysler and Renault share their platforms ?

Do they use the same engines?

I know the new A-class uses the Renault 1.5 DCI. Do any of the cars from Ssangyong/Chrysler have the mercedes 2.2D?

Merc vs BMW vs VAG reliability - RT

The SsangYong and Chrysler models generally use M-B medium size engines, 2-7-3.0.

Now that they're part of Fiat, the Chrysler 300 uses a VM Motori 3.0 engine, also part of Fiat, but still uses the E-class platform from the days when M-B owned Chrysler..

Merc vs BMW vs VAG reliability - balleballe

Hardly the same thing as a skoda being the same as an Audi.

They are based on the same platforms and have the same engines. petrol to diesel....all the same

Merc vs BMW vs VAG reliability - RT

One of the SsangYongs used the ML-class platform/powertrain - the Chrysler 300 used the E-class powertrain/powertrain.

Whether platform-sharing is done well or not is a variable, but platform-sharing isn't a bar to quality.

Judge the engineering, not the label.

Merc vs BMW vs VAG reliability - Alby Back
Still a bit of a luck of the draw thing I guess. I've a three and a half year old E Class which I've had from new and have put 120,000 trouble free miles on. It has the 2.1 "250" CDI engine which has been faultless. My pal has a similar age ML 350 CDI and has has a fair amount of bother with it. I'd have another Merc in a heartbeat but he probably wouldn't.
Merc vs BMW vs VAG reliability - Avant

"Still a bit of a luck of the draw thing I guess."

Good point - but of course, given that a car is the most expensive thing people buy (or have bought for them as a company car) apart from a house, it really shouldn't be a matter of luck, particularly not for a new car.

That's why a lot of people buy Japanese: only a few models are entertaining to drive, but the chances of getting one with problems, even when buying used, are considerably smaller.

That said, 5 of my last 6 cars have been from the VAG stable, and all have been faultless - but I've been lucky enough to have been able to buy new and not keep them for more than three years.

I bought my BMW Z3 when it was seven years old and kept it for five years: that never went wrong either, and I had the impression that it was a high quality product throughout. But it had a full service history and I also think it had been looked after by its two previous owners.

If the OP is buying used, that last sentence is probably more important than anything else.

Edited by Avant on 07/02/2015 at 16:19

Merc vs BMW vs VAG reliability - leaseman

A very good pal of mine, with whom I've had many a good discussion on VAG product reliability over the years, and who is awaiting delivery of a Scirocco, ordered from me and much against my professional advice, has texted me today.

His 61 plate A1 1.6 TDi has given up the ghost in a cloud of black smoke. One day before the warranty expired.

Odd that!. I was convinced that all VAG diesels were programmed to blow up one day after the warranty expired. They're losing the plot!

Merc vs BMW vs VAG reliability - cocorico

Oh dear…

Friday the 13th ?

This morning my 61 Plate Skoda Octavia with 1.6TDI CR, at 60200 miles, Coolant Level Warning Light came on. The Coolant level in the expansion tank is below “Low” mark. Should I expect a big repair bill ?

Merc vs BMW vs VAG reliability - RobJP

Oh dear…

Friday the 13th ?

This morning my 61 Plate Skoda Octavia with 1.6TDI CR, at 60200 miles, Coolant Level Warning Light came on. The Coolant level in the expansion tank is below “Low” mark. Should I expect a big repair bill ?

You should expect to fill it up with a proper coolant/water mix, and then carefully monitor it (every day for the first week, then weekly for a month or 2), and see if the level drops again or not. If it does, then don't do what so many do, and just keep on topping it up, GET IT FIXED.

Sadly, basic maintenance of vehicles, even opening the bonnet and checking oil, coolant, brake fluid, etc. seems to beyond most people. I'm certainly not perfect, but our cars get checked at least monthly. Takes me all of 15 minutes for 3 cars, and that includes tyre pressures and topping up screenwash.

I'm firmly of the opinion that a lot of engine failures aren't down to poor design, but poor owner responsibility.

Edited by RobJP on 13/02/2015 at 14:19

Merc vs BMW vs VAG reliability - cocorico

Thanks Rob.

Will do and update in here accordingly....

Merc vs BMW vs VAG reliability - balleballe

Friend of mine has a VAG engine in a Seat Exeo. Previously had a Honda Accord I-CDTI.

He ran the Accord from 40k - 160k in 4 years

His Exeo he got on 20k and its now on 110k.

The engine in the Accord had an EGR issue and a new clutch flywheel in it's owndership. The engine in the Exeo needed 2 injectors replaced a few thousand miles ago. Also a new clutch and flywheel some time last year.

The Accord used to get 50-55mpg on the motorway, the Exeo gets 55-60mpg.

The Accord had 0 electrical issues. The Seat however has had a few electrical issues mainly with the windows and something about water ingress with dodgy door seals.

He's was going to try a C class Merc next......but the timing chain issue on the current model may sway him against it.

Merc vs BMW vs VAG reliability - corax

The Accord had 0 electrical issues. The Seat however has had a few electrical issues mainly with the windows and something about water ingress with dodgy door seals.

They had the same problem with Leons and Ibizas. The seals were made from a foam type material that degraded over time letting in water.

I can't stand a car that constantly mists up inside.

I would have thought, being a later model, the Exeo wouldn't have suffered from this.

VAG doesn't seem to be able to make a car that keeps water outside. Maybe they should hire a drainage company.

Are their latest models finally leak proof?

Merc vs BMW vs VAG reliability - cocorico

I know it’s a complicated machine after all and need an attention.

But, Am I being too optimistic to expect trouble free motoring ?

Merc vs BMW vs VAG reliability - xtrailman

If you want reliability buy a car with out a turbo, less to go wrong.

Merc vs BMW vs VAG reliability - gordonbennet

If you want reliability buy a car with out a turbo, less to go wrong.

Wouldn't always agree with that, a bit of ignoring of fashionable thinking and makers recommendations can help prolong the life expectancy of these things to indefinate.

Such as ignoring current bad joke oil service intervals (unless well driven very high motorway style mileage), allowing the engine to warm up and cool down a bit before and after driving, and doing your own online research to find out if your particular engine has design faults likely to result in combustion gases or neat fuel finding its way into the crankcase, or in the case of certain FWD German cars a EGR valve made of cheese that takes approx 6 hours to change.

There are lots of other goodies and features i'd not touch long before turbos feature on the list, EPB and DSG just two of the many.

Edited by gordonbennet on 13/02/2015 at 19:40

Merc vs BMW vs VAG reliability - cocorico
I drive 60 miles a day. 50 miles of which are on the motorway. The rest urban/sub-urban. Each end of the trip, I let the engine run for up to a minute to ensure all cooled down nicely. Sometimes more after long journey.

I normally get 60+MPG. I look after my car. It's been serviced only by Skoda garage on schedule. It has been on the long life service regime up to 54k. The car's been running solely on Shell V-Power Diesel.

When I bought my car 3 years ago, there weren't many negative reviews on this engine(VAG 1.6 TDI CR). I believe it was still too new to judge its reliability.

I'm thinking to buy Citroen C4 Picasso with 115ps diesel. Is this engine any good ?
Merc vs BMW vs VAG reliability - xtrailman

I find very little goes wrong buying Japanese.

I've had 7 jap cars, and 5 of other makes, my last three being jap.

Merc vs BMW vs VAG reliability - RobJP

Over the years - so going back to the late 80s - myself and my wife have had cars from :

Rover (1), Vauxhall (2), Landrover (3), Mercedes (1), Nissan (2), Mitsubishi (1), BMW (several of those, currently got 2), Audi (3 of those), Mercedes (1), Jaguar (1), Volvo (4), Renault (2), and a TVR.

The only breakdowns we have ever suffered have been a battery failure (dead cell) on a Volvo 850 and a turbocharger failure on a Jag X-type diesel.

Other problems have been notable by their total absence, though I did have to get an EGR valve changed on a Mitsubishi Shogun a few years back.

Between us, we do 40-50k a year. At one stage, a decade or so ago, I was doing 80k a year. In total, over the years, we must have covered something approaching 2 million miles of motoring.

However, throughout this time, we have maintained our cars properly. Checking levels regularly, ensuring that all servicing is carried out on time, and we both drive quite sympathetically. If I hear an odd noise while driving, I'll investigate it, and my wife does the same.

Unless you buy an absolute lemon, having a reliable car is far more about maintenance than anything else. Buy the finest piece of engineering on the planet, and if you never open the bonnet, then sooner or later, you'll have major problems.

Merc vs BMW vs VAG reliability - Avant

Well said Rob. I could tell a similar tale of about 20 cars (me) and 12 (SWMBO) over 45 years - all reliable except a Fiat (our first and also our last) - and seven of mine and three of hers were Renaults.

A reasonably high mileage, regular maintenance and sympathetic driving are what a car needs. The best thing an owner can do if they need a car only for short journeys is to do a good 20-mile run, say every other weekend, just for the fun of it. The extra petrol won't cost that much and it could pay for itself if the car doesn't go wrong so often.

Merc vs BMW vs VAG reliability - dieseldogg

Having roughly counted, since starting driving in 1978, I have covered about 750,000 miles, in, first a Renault 5, then a VW Polo, then a Citroen BX Diesel, beiefly a VW VENTO, then a FGord Galaxy, and now a Skoda Octavia.

Only the last 2 being bought new.

Never once in all those miles and years have I broken down, beyond self repair, or had unexpected mechanical failures.

Covered quite a chuck o the Continent in the Polo, BX and Vento.

All sans ANY "get you home insurance"

Common sence and mechanical sympathy are apparently uncommon.

PS

The Galaxy reached 253,000 miles on the origional clutch, head gasket, exhaust, gearbox,and 1 front drive shaft, the other failing due to a missed split gaiter at over 200,000 miles.

Quite a few starter motors though, due to stop start driving.

Merc vs BMW vs VAG reliability - madf

Breakdowns /faults since 1985 ish

Company Rover 800s x 3 : failed window motors/switches x lots, cyclinder head gasket, exhaust failed (new car), turbo failed, overheating, clutch failure, squeaking dash.

Company Mercedes 260E 1990: failed suspension, failed ignition switch

Peugoet 106D: failed clutch operating lever, cylinder head gasket.

Merc vs BMW vs VAG reliability - cocorico

Update....

OK, Topped up Coolant Water to the level between MIN and MAX last Friday 13/02/15.

Checked every day and the level fluctuated between MIN Line and MAX Line.

Cold Start, Coolant level is at MIN Line. It goes up to MAX Line after 45 minutes driving.

It stays in the middle for the rest of the day.

I don’t think it lost any coolant since last Friday.

Merc vs BMW vs VAG reliability - Razzy

My Friends 2 year old golf with the 1.6 TDi engine had a similar symptom yesterday.

He took it to the supplying VW garage and they rekon it's something to do with the head gasket, it's apparantly not an unkown fault with these engines. Hopefully your's is something simple as you're talking mega wonga otherwise