Opinion of Royal Purple Oil

wvw71 · #1 (**permalink**) 03-26-2011, 06:21 AM

Is anyone running Royal Purple 15-40 and what do you think of it?

Smoke2008 · #2 (**permalink**) 03-26-2011, 01:54 PM

Does Royal Purple make a CJ-4 approved oil....If so where did you purchase it. I sure would like to know and also did you see any 5W-40 ...I have a 2011 6.7L Super duty...I like Royal Purple use the 5W-20 in the Mustangs 08 and 11. If it's available I would think about using it...I would look at the cost....I'am using Shell Rotella Syn 5W-40 ...I can purchase a gallon for 19.50 at Walmart.

09monster · #3 (**permalink**) 04-02-2011, 10:58 AM

Good oil but breaks down way too fast

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