Quote:
Originally Posted by X25
Just to make it clear, 15W-50 actually increases oil temps; it just lubricates better at very high temps, which is why GM recommends it, not to lower temps.
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X, why does it increase temps? My understanding is it doesnt shear at higher temps like lower viscosity oil hence like you said it lubricates better but havent thought about temps yet. Pump might work harder too a bit.
By the way I run 5w-50 amsoil, would recommend that over 15w-50, the 15 at colder temps needs to be warmed up good.