Originally Posted by dsc
Use whatever weight the manual says to use. If the manual says 5W-30 it's because the clearances in the motor are designed for that viscosity. Using a heavier oil will result in reduced oil flow. Why would you want that?
Also, why is the motor using oil after only 50K miles? Is it a leak issue or a oil burning issue?
Bull****. They say 5/30 to meet CAFE requirements. If the 'tolerances were designed for a 5/30', then why the **** do Brits run 15/50 in the same car no problem?
i love oil old wives tales: "My granpappy said..."