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Ask Mobil Archive -
Diesel Engines
DateQuestionAnswer
04/11/2009
Is it OK to use CF-4 Motor Oil in a Volkswagen TDI Engine?
I have a VW TDI 1.9 turbo diesel year 2003, 5000 mile oil changes. Currently using Mobil 1 5W-40 light truck diesel rated CI-4. Have used Mobil 1 15W-50 rated CF-4 in the summer, can I continue this p...
We recommend you use Mobil 1 Turbo Diesel Truck 5W-40 all year as it is the best choice for this application.
02/15/2009
What Are the Benefits of Low Ash Oil?
What are the benefits of using "low ash" oil? I have some Mobil 1 low ash for my Mercedes diesel. Can it be used elsewhere?
Low ash oils typically are used for diesel vehicles that have a DPF (Diesel Particulate Filter) so the carryover oil that makes it into the exhaust system does not foul the particulate filter.  We rec...
01/06/2009
Best Oil for Achieving High Mileage in Turbo Diesel Engines
We have a '98 Suburban with a t/d 6.5 with 255,000 miles. It has been run with Mobil Delvac 1 since about 75,000 miles (prior was Mobil 1). Engine is great; changed every 5k approximately. We also hav...
Mobil Delvac 1 ESP 5W-40 is a fully synthetic supreme performance heavy duty diesel engine oil that helps extend engine life while providing long drain capability and potential fuel economy for modern...
01/05/2009
Was a Dodge Ram Harmed Since CJ-4 Oil Not Used
I have a 2001 Ram diesel truck with 57,000 miles on it. I've used Mobil 1 15W-50 since it had 500 miles on it. I will be switching to the new 5W-40 turbo diesel truck. Did I do harm to my engine becau...
No.  CJ-4 is a certification valid for 2007 and newer engines due to new EPA requirements.  You should be fine.
10/28/2008
Which Motor Oil Is Best for Engines Using E85 Fuel
I am using E85 fuel in a converted Honda engine originally not designed for its use. One of the primary concerns of this is the formic acid created in the event of water contamination of the fuel. I h...
We recommend you use a heavy duty diesel product if you want additional acid neutralizer. We recommend you try Mobil 1 Turbo Diesel Truck 5W-40 as it is based on HD diesel technology, which contains a...
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