It's oil change time, and I have bought Mobil 1 5w30 ESP 507 spec for my A3 2.0TDI.
The oil that's already in the car is filthy, despite only having been in there for 8k.
I also have 5 litres of fresh oil (5w30) that was destined for my Ford Focus before I sold it.
My question is, would it make sense to drain the old oil, put the Ford spec oil in for a day or two to dilute the crud thats left, then drain that, change the filter, and put the Mobil 1 507 in?
I'm planing on extracting the oil from the top, so may leave some in the sump. Would the wrong spec ford oil cause any problems if left in the engine in small quantity?
i just think it's better to have some wrong spec clean oil, than some right spec filthy oil.
Wondering about your thoughts on this....