Castrol or Mobil Synthetic?
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07-06-2005, 11:42 AM
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07-06-2005, 03:55 PM
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Originally Posted by IS300TOG35
Randy, why 10/40? I plan to make the switch to synthetic oil using Mobil 1 w/ Mobil 1 filter, is 5w30 a good grade? I know with the reg oil my dealer uses in my car is 5w30. Should I keep using that grade or change to something different?
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