Mixing motor oil brands?

[ZGskibum]

For my last oil change I bought a case of the now-discontinued Schaeffers race oil in 502 formula. Still have 5 quarts left. Is there any issue with me using those and topping off with 2 quarts of, e.g., Motul, in the same weight for this next oil change?

[xpoweruk]

That will be fine :)