In 1999 my 1989 F-150 was using Mobil 1 10W-30 with a Motorcraft FL-1A oil filter. My 1996 Ford Contour was using Mobil 1 5W-30 with a Motorcraft FL-200S oil filter. In 1997 & 98 I was using Castrol and other 5W-50 oils in the Contour. Didn't kill the car but hurt the seat of the pants power feel and my gas mileage. For my type of driving there was no point in using it as the car is spec'd for 5W-30.
Whimsey
Whimsey
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