mixing oils???

[PSYKO PHOENIX]

hi all this is prob a silly question but can uh mix oils? I've just put in some castrol magnatec 10w40 but I havnt got enough to get it up to full, can I mix in some castrol edge 25w50 or some gtx 20w50?? Or will that damage the engine

 

[hakhawk]

please post in the right section next time.

thread moved

 

[The1]

i personally wouldn't

 

[hako]

My personal opinion is that it will cause absolutely no harm at all. There are no ingredients/additives in engine oil that will cause damage when mixed - the only negative is that additives may be diluted by adding a different oil....and a lot of additives are only snake-oil. Oil manufacturers will have you believe you cannot mix oils but offer no proof...only self-interest.