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Ask Mobil Archive -
Mixing Oils
DateQuestionAnswer
02/24/2010
Mixing Motor Oil Viscosities to Achieve 0W-40
0W-40 is not available in my area. What other weights can I blend to achieve 0W-40? Example: 1 quart of 0W-30 mixed with 1 quart 10W-40 equals 0W-40?
Viscosity grades cannot be obtained as described. Please follow the manufacturer’s recommendation and please use the oil as it was manufactured. Our online Product Locator shows there are at least 10 ...
07/25/2009
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...
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.
02/13/2009
Is it Okay to Mix Conventional and Synthetic Transmission Fluid?
Can synthetic transmission fluid be mixed with conventional transmission fluid?
Yes, you can mix Mobil 1 Synthetic ATF with conventional transmission fluid.
06/14/2008
Any Problem if Diesel Engine Oil Is Added to an Engine Filled with Non-Diesel Oil?
I have Mobil 1 Truck & SUV in my 1991 Mercedes Diesel. Will anything be hurt by adding a quart of Mobil 1 diesel engine oil??? On the road, it was all I had... down a quart... Thanks
No, there is no issue with mixing Mobil 1 products.  Your engine should be fine.  In fact we would recommend you use the Mobil 1 Turbo Diesel Truck formulation in your truck in the future.
03/25/2008
Is There Any Harm to Mixing Different Mobil 1 Viscosities?
I drive a '97 BMW 540i (85K.) on 0W-40, and a 2005 Subaru 2.5L (25K.) on 5W-30. I have used Mobil 1 for at least 10+ years now. I do keep drain intervals right at 5,000 miles on all of my cars, as it ...
Today’s modern vehicles require a less viscous oil in many cases than in the old days. Having said that there is no harm in mixing different viscosities of Mobil 1. They are all compatible with each o...
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