Mobil 1 15w50 mix ??

[fordpm]

I have 1 qt.of M1 15w50 ss (old formula-red label) is it ok to mix with 5 qt.of reg. M1 5w30 for 2003 Ford f-150 5.4L (6 qt.capacity)???

 

[Mitch Alsup]

99% yes. You should end up with a rather thick (12 cSt) 10W-30 weight rather than the rather thin 10 cSt Mobil 1 5W-30 generally is.

 

[ToyotaNSaturn]

Regular M1 5w-30 is 11.3cSt @100C now.

 

[Triple_Se7en]

I agree with ToyotaNSaturn - your Mobil-1 is not thin.

I used that exact formula (1) 15W-50 with (5) 5W-30. Even added a full bottle of VSOT to it in my DOHC Colorado 4X4. No complaints from the 3.5 L5 that's pulling it.

 

[Racerjk]

It's cool they bumped the vis on regular M1!

 

[sprintman]

I'm going from M1 5W50 to to M15W50. Painless.