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  1. R

    GM 4718 VS DEXOS 1

    Which spec provides the best overall protection ?
  2. R

    shell synthetic how good is it??

    Shell synthetic. Is it better than PYB? ? How come it doesn't meet Dexos 1??
  3. R

    2004 Pontiac Grand Prix GTP oil help

    hey guys this is my first post , but i been following you guys for awhile. great info on this site. Enough of the mussy stuff I have a 2004 grand prix with just 99,000 miles. the question is shoud i switch to pyb 5w30 or 10w30 for my smooth running 3800S/C motor or stick with P/U 5w30. the reson...