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I ran RP in my 2006 Ranger for 3 years.
I did not put it in the front dif. However, I did put it everywhere else.
It is a good product and worked well.
I would suggest using a heavy duty or extreme duty turbo specific oil. Ask the dealer what they run in the Sterling trucks.
No one will know how well RP works in the EB motor until someone gets 75k+ miles on one with RP in it. I know Mobil1 served me well in my wifes old Sunfire. 147k miles all driven with Mobil1 in it. Pulled the valve cover to take a peek and it was spotless in there. Not even discoloration. I was pretty dang impressed.
I am researching oil options for my new FX4 Eco Screw and I am wondering what everyone thinks of RP synthetic oil?
There's alot of good oils that cost less and will do you a great job.......run an oil for 200K and then you can say whether its done its job or not........I know I'm in the minority......but I;ve run QState in everything i own and I've had no problems at all..............getting close to a million miles on all my Fords combined.....all on Quaker State 5W-30.