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No, that's ok also. I wouldnt want to do it, (archive)

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Posted by Paul E on June 22, 2000 at 12:43:21:

In Reply to: Just not synthetic + Natural posted by PeterM3 on June 22, 2000 at 09:32:45:

: : 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

personally, however, Mobil will tell you that no harm is done by mixing the two. ..If there really were a 'proscription' against doing so, then you would be admonished to make sure and perform a complete engine flush whenever changing over. this is NOT the case.

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