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  1. R

    API rating on Motorcraft diesel engine oil 15w-40

    Today I asked a mechanic at the Ford dealer about the oil they use in diesels. He said they use bulk oil from Mobil Oil when they do an oil change in the bay. I ask the parts department for a bottle of oil for a look to see if it had API on it. Which it didn't. I don't know who packages their...
  2. R

    API rating on Motorcraft diesel engine oil 15w-40

    thank you. for the reply. In your opinion, do you think it's ok if use Tractor supply Traveller's diesel engine oil 15w-40 in my F250 which is considered light duty use?
  3. R

    API rating on Motorcraft diesel engine oil 15w-40

    The owners manual on my 2015 F250 diesel doesn't say what API rating the engine oil to use. It only gives the Motorcraft oil to use which doesn't give any API specs. What would be the API I need to look for if I want to use some other Diesel engine oil?
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