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Yes, it's fine. Avoid mixing brands if possible. (archive)

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Posted by Benjamin Treynor on June 22, 2000 at 02:38:40:

In Reply to: HELP! Is it safe to mix oils with different weight posted by ...??(m) FC on June 21, 2000 at 19:42:49:

Yes, it is safe to mix oils of different weights, although it is recommended that you mix the same brand of oil. I recommend mixing the heavier weight of oil if you're going to the track, as engines run hotter under track conditions. FYI, the result of mixing two different weights of oil is a mixture with effective characteristics somewhere inbetween the two weights mixed. As your oil accumulates mileage, its effective viscosity drops. Mixing in heavier oil will bring the overall oil mixture back closer to original viscosity.

FWIW, I've never heard of anyone having a problem mixing different brands of oil. There's a theoretical issue with incompatible additive packages between different brands, which is why I recommend against it when possible. However, practical incidence of such a problem seems to be negligible.

Cheers,
Ben


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