My question which has been misunderstood. Question is, if I was to by a used car and this had been driven on petrol instead of diesel and then wrong fule cleared out and no faults at the time, i was to by that car with a warranty, etc and then the problems showed up like a faulty injector, dpf etc, can things go wrong after a mis-fuel 2 years down the road and will the warranty people avoid the claim by saying the car was misfuled at some point?

Apologies for misreading earlier query. But in the scenario you propose, 1) it's probably impossible to verify an earlier misfuel episode and 2) after 2 years no warranty would cover any such event even if it could be proved. It could be a valid explanation, that's all.

Most misfuel episodes make a car undriveable so they have to be sorted immediately. Hence permanent damage is unlikely IMHO.

As Andrew answered, no one would be able to tell conclusively if misfuelling had happened 2 years down the line.

As for warranty claims, it's more than likely that an aftermarket warranty will wriggle out of an expensive claim anyway, the warranties to generally trust are those provided from new for long periods, ie Kia Hyundai Toyota who make vehicles of the sort you are considering, or to buy approved used from a franchised dealer where the warranty (often extendable) will be as good as on the new car.

It might be interesting for you to find out how much extending the maker's warranty would cost you per year after the initial warranty has expired, that might give some indication as to how much faith the maker has in their own product, take into account Kia warrant for 7 years, Toyota and Hyundai 5, so arguably they already expect their vehicles to be reliable for longer...all these makes require full service records to maintain warranty and qualify for makers extended cover, so vehicles bought from indy dealers who might have serviced the thing themselves or those vehicles with chequered servioce histories might scupper makers warranty anyway and almost certainly maker's goodwill after warranty expires will be off the table.

Honestly i wouldn't be too concerned about avoiding a previously misfuelled vehicle and rather concentrate instead on finding the right make and vehicle worth your money.

As our resident car dealer guru will often say, the best examples of nearly new used cars are usually found within the maker's dealer network, they get first choice, take from that what you will.

Edited by gordonbennet on 18/09/2020 at 10:31

2 years down the road and will the warrnty people avoid the claim by saying the car was misfuled at some point?

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The warranty people would have to suspect any fault was caused by previous mis-fueling. How are they going to get that idea? Many years ago I accidentally put about 6 litres of petrol into my diesel car. The tank was empty so I took a chance and filled it to the brim with diesel and got in about 65 litres of diesel. The engine never missed a beat and went to do 115K miles in the next 3 years. No issues at all. I think you are worrying too much. If you consider every possibility of things going wrong you would never leave the house. Have a bit of faith and be careful when filling with fuel.

Cheers Concrete