Engine Oil

[Lou Knee]

is it OK to mix one brand of engine oil with another as long as they are both the same grade?

[v64paul]

depends really. it's not good practice but if the engine is quite high mileage and to be polite, not a particularly high tech unit, then the correct quantity is the important thing. obviously it's better to change the oil regularly and try and keep to the same brand. but, if it's the same grade and type then no harm done.

[Lou Knee]

ta muchly mate.....XXX

[honkytonkman]

No worse than using different brands of petrol. As long as the specification, grade etc is the same you should have no worries.

[vijzelgracht]

Mixing grades is OK (but you end up with a strange garde that's neither one thing nor the other), but you mustn't mix mineral, synthetic or semi-synthetics.