Mixing oil weight/Brands

[kschachn]

Originally Posted by DavidJones
I've heard that oil blends like you are asking about can form a greasy gelatinous blob when stirred by a push rod engine. Use care.

Not if they meet ASTM D6922, which they do if they meet API specifications. That's exactly what it addresses.

 

[DGXR]

I will gladly mix 2 different brands / weights of oil, but 3+ brands is outside of my comfort zone. You'll *probably* be fine.
Personally I would mix the Mobil and Castrol for 1 service, then mix the PUP and Valvoline for another service.

 

[jayjr1105]

I keep an empty jug and pour in whatever I have left over from several oil changes I do. I finally have a full 5 qt jug. Mostly a mix of 0w20, 5w20, and 5w30 (very little 5w30). I'm really nor sure where I'm going to use it. Most likely in the Van next summer.

 

[SatinSilver]

I try to do as little mixing as possible. When I do I'll only use one quart mixed in with 3 quarts of the other oil. In the other car that takes five quarts I'll use one quart of the different oil along with 4 quarts of the main oil. So kind of a 75/25 or 80/20 mix in ratio.

I had this car gobbling up oil with mostly hwy miles when using MC 5w20 syn-blend. Topped off with Mobil 5000 and after a thousand miles or so it burned another quart. Topped off again with some Valvoline Maxlife along with changing the pcv valve. No more oil burning after that.