I am not sure this is in any way new. Direct Injection has been in europe/japanse cars since the 90's and is in common use today, and it's basics for any diesel to pump burnt fuel back into air intake system.

Almost 25 years in the motor trade are well aware of the issues. Most engine handle this issuie OK, a few bad designs are out there it has to be said.

Hi any update on Gdi engines my Hyundai 1.4 gdit drinks oil and gas a rattling noise that sounds like pre-ignition but can't swear on it. No lack of performance or fuel economy I can see. Took it to a mechanic who said he thought it was ok but that still doesn't convince me as I have the oil consumption. It's done 50.000 has always been serviced with the recommended oil I hope.I live in the sticks in Wiltshire no one knows much about Gdi issues here any thoughts?

It isn't unusual for some engines to drink oil, I think the key thing would be how much?, and is that excessive?. Also, how long have you owned the car for and has the oil consumption got worse during that time?.

If the oil consumption is within what is considered acceptable (presumably you told your mechanic how much oil it uses and he considers it not to be a problem?), and assuming it hasn't got worse during your ownership, given performance and economy are fine, I wouldn't be concerned about it.

One last thought, is there a Hyundai/Kia forum?, if so, ask on there.

Hi any update on Gdi engines my Hyundai 1.4 gdit drinks oil and gas a rattling noise that sounds like pre-ignition but can't swear on it.

Re pre ignition my Superb 1.4 tsi direct injection EA111 has always been prone (owned from 14 months old) to this using some types/makes petrol but it's difficult to hear as the car is so well soundproofed. I really heard it driving uphill in a built up area in France. Filling up with 98 RON petrol seemed to really help. In the UK I try to use Tesco Green-energy 99 RON (also E5). I don't think it's just direct injection turbo engines though - my previous petrol 1.4 16v NA Octavia was prone to a bit of pre ignition with some types of petrol.

Many wouldn't notice it these days due to improved sound proofing but I recognise it from my days of tuning Essex V6 engines (porting, cam etc) and running them with ignition as far advanced as you'd dare to get the best of 5 star when still available and 4 star when it wasn't! (OK that's showing my age!). It ran like a bag of spanners on two or three star petrol if you had no choice to put some of that in. I suppose it was the re-mapping of the day!

NB My 1.4 tsi uses negligible oil @105k miles.

Edited by Big John on 11/07/2022 at 18:46

For what it's worth as a contribution to the general question about GDI, I have a 6 years old Toyota Auris 1.2T, which uses direct injection. It has done 59,000 miles and I have owned it for the past 48,000 miles. I have always used Shell V-Power petrol and it has given no problems so far. Burns no oil, performs as well as when I got it (including pulling from low revs if I am cruel to it), and returns mid-50s mpg on the motorway in summer.

So unsurprisingly it looks like some manufacturers 'do' GDI better than others. Using a higher-grade fuel might be useful for anyone experiencing problems -- it's got to be worth the extra cost of a few tanksful to find out, compared with the cost of stripping down!