Ask a Question

Ask Honest John

Most recently answered engine oil questions
My car maker advises fully synthetic 5W/30 engine oil. Are all oil brands of 5W/30 equal?
I have just found oil in my radiator and expansion tank. Any thoughts/suggestions as to what this could be?
Can there really be any difference in engine oils with specification 5W/30 and that meet ACEA C3 for diesel cars? I see that several oil manufacturers produce engine oils for specific cars, eg. VW cars,...
What's the right engine oil for a 2009 Citroen C5 2.0-litre petrol? There are so many brands and so many different types of 5/30 and 5/40 oils but which is the right one?
Can I use 0W-16 oil in newer normal family cars? 0w-16 has been around for a few years and is Mobil, Motul, Pennzoil, Idemitsu and German make Ravenol all offer it. Ravenol's field tests were positive...
My petrol-engined Toyota Yaris Verso runs happily enough on 5W/30 semi-synthetic oil. It returns about 1600 miles per pint of oil. With 135,000 miles on the clock, would the engine benefit from an additive...
What oil do I get for my Villiers two stroke engine and gearbox? Recommended is BP Energol sae30 and sae20w?
I have an Audi A6 2008 and last week on the way to having a service, the car blew loads of blue smoke out of the exhaust. It was towed back to my address and I had a mechanic come out look at it - they...
Why does the temperature of the oil in my Volkswagen Touran keep rising when I am driving?
I read in a recent 4x4 review that the engine oil is quickly contaminated by the DPF. Is this the case on all diesel engines with a DPF, and can it affect the life of the engine?

Value my car