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Old 11-26-2010, 04:53 PM
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Quote:
Originally Posted by sprintertech View Post
no your right.....i would not use royal purple either.....i use mobil 1
I also use M1 synthetic and the inside of my 3.7 is sludge free at 90k miles. I change it at every 5k along with the filter. Right now, I'm trying out the extended life formula that claims 15k between changes but I plan to change it at 10k. Around 5k, I'll pull a valve cover and check for any signs of trouble.
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