mixing oils of differing viscosity

[Renthorin]

Can it be done? I have several quarts left over and each is of a different viscosity. All are Mobil 1 syn.

If I take one 15w/50 and one 5w/30 and add them together do I get 10w/40?

Any downside?

 

[Nick Micale]

Mixed lots of oils like that and never seen a problem.

 

[Tow Man]

If all are synthetic and even the same brand, mix away! If they were different brands I would worry about different additives reacting with eachother, but I doubt that would even happen.

As far as what the actual viscosity would be? I have no clue! Maybe one of the resident rocket scientists could give you a formula

 

[Two Lane]

HAVE NO FEAR

The "DON"T MIX MOTOR OIL!!!" hysteria arose over people pouring in high-detergent oils into older cars that had never had anything except non-detergent oil...50 YEARS AGO.

When enough high-detergent began flowing through the ND engine, all kinds of gelled oil/dirt residues began de-attaching itself throughout the engine...from the VCs down...through a caked-up lifter valley, eventually arriving in the oil pan, clogging the oil pump pick-up & oil-returns. (What do you think this did to the motor?)
_______________________________________________

Your situation is radically different. Contemporary engines & oils do not have these kinds of compatibility issues.

Use what you've got and sleep well!

 

[The Radius Kid]

Originally posted by Nick Micale
Mixed lots of oils like that and never seen a problem.

It's heresy,I tell ya',heresy!
The next thing you know,buses will run on time.