I know theres a thread about mixing viscosities but doesn't really tend to my question..

Long story short. My brother mixed his oil with my top-off bottle of oil with mine by accident.

He either mixed 5w-30 or 5w-20 in my half full bottle of 10w-30. Both oils are Mobil 1 synthetic.

I don't want to waste completely new oil and was wondering if it would be fine for me to keep using the mixed oil for top-offs? Or should i just pitch the oil and call it a day?

 

I say just use it and call it a day. No need to toss it.

 

It is perfectly fine to mix multi-weights as long as they are the same type and brand.

 

great, i guess i'll just use it then.

thanks.

 

The only true debate is: "Is Mobil1 a synthetic oil"


RACER Posted on May 25 2007, 09:09 AM
Period.
No ifs & buts.

There is no evidence at all (as in UOA's) that support the thought that you can't mix 2 brands and /or type of engine oil.
The thought is that in some rare case 2 different brand of oils with their different additives may decrease the effectiveness of one of those additives a little.
At the same time it may increase another.
Different additve packs may occur in same brand oils too, even in same brand & same type of oil if the manufacturer changes its formula.
And they change it without telling anyone!

IMO a bit of 5W-20 is doing that thick (when cold) 10W-30 some good

 

Its pretty hot here in ohio right now... but OH WELLS.. I feel better now that im not wasting a whole quart of oil.

 

[QUOTE=Teawins21,May 25 2007, 08:45 PM]Its pretty hot here in ohio right now... but OH WELLS.. I feel better now that im not wasting a whole quart of oil.