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Mixing Motor Oil Viscosities to Achieve 5W-50 Oil
I want to mix Mobil 1 5W-30 with 15W-50 (1:1 ratio) and run it in my 2002 Porsche 996 C2. I have two reasons for wanting to do this. First, I live in a region where freezes are rare and it is very hot 8 months out of the year. Second, 5W-50 (what I want) is difficult to find here, the Mobil 1 5W-30 and 15W-50 are readily available in gallon-sized jugs (sometimes value priced). I want to mix them to get the 5W-50 mix I am looking for. Good idea? Bad idea?
-- Lee Thurman, Weatherford, TX
We recommend you use Mobil 1 0W-40 all year. It will give you outstanding protection at low ambient temperatures as well as at high operating temperatures.