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Diesel Engines
Need to Switch a Volkswagen Jetta TDI Off Mobil 1 0W-30?
Hello, VW Jetta TDI. I think I put the wrong synthetic in. I used the Mobil 1 0W-30. I thought it had a CD rating. Your web site recommends Mobil 1 Turbo Diesel Truck 5W-40. Should I change it? or wil...
Mobil 1 0W-30 Advanced Fuel Economy is engineered for gasoline engine vehicles but it does meet API CF which exceeds API CD.  For maximum protection, we recommend you switch to the diesel engine oil s...
What Are the API Ratings for Mobil 1 ESP Formula M 5W-40?
Mobil 1 ESP Formula M 5W-40 versus Mobil 1 Turbo Diesel Truck 5W-40. Is the ESP formula at least CI4-Plus approved? I can't find any API rating specs on this oil, only Mercedes specs. The reason I ask...
Mobil 1 ESP Formula M 5W-40 is a high quality engine oil but it has only been tested against the stringent MB 229.51 specification. Although it is likely to perform well in other applications, it has ...
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.
Any Problems Using an Oil Bypass Filter and Synthetic Oil in a Pickup?
I have a 2002 F-250 7.3 liter diesel with 133,000 miles on it. I have been looking towards some items that should lengthen its life span. One of those is an Oil Bypass filter (particulate > 5 micron)....
Both improvements you are making should definitely improve vehicle life. We recommend you use Mobil 1 Turbo Diesel Truck 5W-40. It will provide outstanding lubrication at both high and low temperature...
Explain the Differences Between the Diesel Motor Oils
I noticed on your web site that the Mobil 1 Turbo Diesel Truck 5W-40 is rated CJ-4. I currently use Mobil Delvac 1 ESP 5W-40, which is also rated CJ-4 in my 2008 Chevrolet 2500HD Duramax Diesel. Are t...
Both products have different formulations and both exceed API CJ-4 requirements. Either product, however, can be used in your particular engine. Mobil 1 Turbo Diesel Truck 5W-40 is specifically formul...
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