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Can Today's Mobil 1 15W-50 be Used in Diesel Engines?
 
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Question:
Can Today's Mobil 1 15W-50 be Used in Diesel Engines?
When I first bought Mobil 1 fully synthetic 15W-50 it stated on the container that it can be used in diesel engines. The newest batch I bought does not state that any more. Can I still use it in my diesel tractor engine? Thanks, Rob
-- Rob Liefveld, Three Rivers, CA
Answer:
Originally, Mobil 1 15W-50 was approved for API CF but because most diesels today require a higher quality, we elected to stop claiming API CF for the product. For older diesels where API CD or API CF, Mobil 1 15W-50 would still provide these level of protection even though it is no longer approved for this application. A much better Mobil 1 product for your application is Mobil 1 Turbo Diesel Truck.  
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