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Old 04-10-2012, 11:11 AM   #19
TRMach1
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Join Date: Aug 2002
Location: New Castle, Delaware USA
Posts: 3,370
Re: switching from mobil 1 to Royal Purple

I don't know what to think about this whole oil branding thing. I used Mobil 1 full synthetic, 5w20 in my stock motor for over 60k miles, never a problem.

When I was having my Aluminator installed, we were on the phone with a Ford Racing tech about an unrelated issue, and he said to break the engine in for 500 miles on regular fossil blend 5w30 oil, then switch to a full synthetic 5w30, but to never go back to the 5w20! Almost four years and 12k miles later, of using Mobil 1 5w30, here my car sits with a broken engine!

How much the brand and weight of the oil played in the engine failure, I have no clue. Maybe we'll learn something more when it is finally torn down in the next couple of weeks, but one thing is for sure, the rear main seal and bearing are toast, and I'm guessing at least one, or more, rod bearings are gone, and possibly the oil pump!
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