Petrol in a diesel.

[Konan555]

Hardly has to worry about det with diesel in.

My car runs on a similar mix of petrol and oil. Although that's due to the valve stem seals methinks.

[Konan555]

As for diesel in a petrol, don't know what it would do but you can't put a diesel nozzle into a petrol car thankfully!

The reduced size of the nozzle was introduced (as far as I know, I was about 6 at the time) to prevent people from putting 4 star into cars with catalytic converters. At least I know this was the case with fords.