5w50 Synthetic - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 01-17-2011, 03:59 AM Thread Starter
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5w50 Synthetic

Changing my oil today and was planning on going synthetic. I see alot of guys running 5w40. Any issues with 5w50 Mobil One.

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post #2 of 4 Old 01-17-2011, 10:03 AM
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I am not sure if that's a diesel rated oil, or at least rated for the PSD engines. I'd stick with the Mobil 1 TDT 5w-40. However, if you want a 50 weight oil, Mystik is a partial synthetic 15w-50 rated for the PSD and has lots of positive feedback. I believe it is made by Citgo.
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post #3 of 4 Old 01-17-2011, 11:38 AM
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thats heavy oil. but as said make sure whatever you're getting is CI4 or CJ4 rated.
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post #4 of 4 Old 01-17-2011, 12:10 PM Thread Starter
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15/40 is what a lot of guys run. That 5w50 shouldn't be heavier than that. What's the difference between 5w40 and 5w50 as far as viscoity is concerned?

From what I found all Mobile one oils meet diesel specs with exception to an anti foaming additive which can be bought from Navistar.

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