YACT: Is mixing synthetic and non-synthetic motor oil harmful to the engine?

[tnitsuj]

I changed my oil today and after draining the oil discovered that I had only 2 quarts of Mobil 1 instead of 4 as needed. So I went ahead and used 2 quarts of Mobil 1 and 2 quarts of the same grade Supertech oil my Housemat had handy. Is that going to cause me problems before my next oil change 5k from now?

 

[Evadman]

They are compatable.

 

[Shawn]

I dunno but i did the same thing last oil chance. Good question.

 

[FrustratedUser]

No harm done.
I believe there are semisynthetic oils out there which pretty much is a mix.

 

[Lvis]

No problem, they sell blends in most any store.

 

[Howard]

Ithinktheanswerisno.