Originally Posted By: Danh
Originally Posted By: demarpaint
Originally Posted By: Danh
In the OP's case, if the used oil analysis shows low viscosity considering a blend of 0w-20 and 0/5w30 to provide a viscosity cushion seems prudent. The Widman viscosity calucator can help determine the right proportions.
That's really a [censored] shoot though, at least according to the oil companies, and some of the more knowledgeable members here. The problem is you really don't know what the outcome of the blend is going to be. It has been discussed as well as argued here. If the OP is really concerned with fuel dilution or it's flagged on a used oil analysis bumping up a grade to a 0W30 or 5W30 isn't going hurt, in fact it might help. A used oil analysis would settle any doubt about it too.
True, but blending Mobil 1 0w-20 and 0w-30, for example, should be a low risk proposition as would Pennzoil Platinum PurePlus 0w-20 and 5w30. Agree blending different brands or product lines isn't the best idea; even the Widman calculator offers this caution.
It should be, but if you call them and ask they'll advise against it. Yes even mixing Pennzoil conventional with Pennzoil conventional, PP with PP, and PU with PU. And if you call XOM they'll tell you the exact same thing. They'll tell you to use one grade or the other. While the oils will mix the end result of the blend is a [censored] shoot, and they will not guarantee results. I went through the bother to call and ask.