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i put a 10w-30 in my truck last winter and it started alot better than the 5w-40 i run in the summer. It was Rotella tho...not mobil 1. I don't drive my truck in the winter...i just start it up from time to time and the thinner oil makes it start and idle better when cold. I plan on putting in some amsoil 5w-30 next month
 

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Is the Mobil API rated for diesels?? I know the Rot T5 is 10-30 rated for diesel use.
 
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