I've been running RP in my truck since I purchased in May 2005 and installed the accusump with that first change from Mobil 1 to RP. I've only put 2800 miles since buying the truck new and have not changed the oil. I know that they suggest changing it ever 3K miles, but is there a time limit when you should be changing your oil no matter the mileage?
I was wondering the same thing and never got a answer on my thread. I went onto RP's website and a supercharged big block should use 20W50. I bought some yesterday, but havent changed it just yet.
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