Mixing motor oils?

[angrybaker]

Hello. I had a question about mixing oils. I usually use Mobil 1 0w40 but Amazon just raised the price. Castrol edge 0w40 is now on sale at $23/5Qts. I have about 4x1qt of the Mobil 1 left. Would it be ok to use 5qts of the Castrol and 1.5 Qts of the mobil1 for my next oil change? Or rather, would YOU do that? Both oils are 0w40 and LL-01 approved, European car formula.

Thanks

[jaye944]

hey there,

so my 30 or so years of driving cars, (and insofar as the expereince of long term use of them) 10 years with my 944 as an example

ppl will tell you "not to mix oils"

an TBH I always tried to have spare quart of what ever oil I changed in the boot, just in case,

however I have mixed oils and in cases of emergency grades

did my engine blow... no, did performance suffer ...no, did I experience any kind of issues... no

so, the moral of the story is
no don't mix oils, but real world experience I've NEVER noticed any issues

HTH

and in your case, NO PROBLEM

[Iron Man]

Originally Posted by angrybaker

Hello. I had a question about mixing oils. I usually use Mobil 1 0w40 but Amazon just raised the price. Castrol edge 0w40 is now on sale at $23/5Qts. I have about 4x1qt of the Mobil 1 left. Would it be ok to use 5qts of the Castrol and 1.5 Qts of the mobil1 for my next oil change? Or rather, would YOU do that? Both oils are 0w40 and LL-01 approved, European car formula.

Thanks

The add-packs for the two are quite different, but I think for a one time instance it should not be a problem. I mean when you do a regular oil change and go from one fill to another, there is always some of the previous fill still left behind.

I just would not get in the habit of doing something like this all the time. API specs require that all oils can be mixed, but it doesn't mean that it is optimal for engine wear.