27-04-2023, 12:12 PM
You could drain the oil and see if it smells of fuel, and could also test whether its diluted by putting a drop of the sump oil on a smooth vertical surface (like the outside of a 5 litre oil can) and then doing the same with some fresh oil and comparing how far the two drops run. Also worth draining the oil if you have a sports sump in just in case your oil is sitting on some water, if the oil pickup doesn't suck up the water it won't turn the oil to that nasty Mayonnaise.