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  1. R

    Co-Op D-MO Gold SL 0W-40

    My new favorite oil, for anyone in Canada who has access to it. The Co-operators make a number of oils that look pretty decent on paper, including an oil marketed for passenger cars called Sonic Gold SL 0W-30. It and this HDEO 0W-40 touts as having a PAO base-stock right on the container, so at...
  2. R

    DexCool Sludge; Cleaning

    Not to start the DexCool debacle, but needless to say I have an issue with a 2002 Pontiac Grand Prix (3.1L automatic). Its not my car but someone I know has owned it for a few years now and awhile ago it was recommended to have the cooling system flushed when the car was taken to an oil change...