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Originally Posted by powers1
Great information.I agree with some of your points!But who is using 15W-50 oil?Eddie is asking if he can use 5W-50!!!!!!!
Btw,you are forgetting the fact that not only are we referring to a DIESEL engine,we are refering to one with a Turbo!Since the oil also has to lubricate the this ,it needs to be able to deal with higher temperatures than in an normally aspirated engine.
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Regarding "who is using 15W-50 oil?". I use the 15W-50 oil in my 2001 4.4i (gasoline); have about 72K miles on it; 25K of which have pulled an 8,300 pound GVWR 31 foot Airstream travel trailer.
Regarding the turbo, almost ALL of the industrial diesels are turbo charged. Listen the next time an 18 wheeler passes you (or you pass it) and you'll hear the high pitched whistle/whine of its turbo fluctuating as the driver throttles the engine. Modern synthetic diesel engine oils are formulated to deal with turbo charging.
Read my article "Lubrication 101" for more info on synthetic oils.