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Old 03-15-2005, 04:58 AM   #1
Paso76GMCstepper
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Join Date: Jan 2004
Location: Paso Robles, CA
Posts: 347
Synthetic Oil in 76

Ok guys I have a 76 K15 with a 350 motor with maybe 3500 miles on a rebuild. I want to go full synthetic. I have Mobil 1 5W40 in it now. Im thinking of going Royal purple in everything, motor, 4spd, transfer case, front and rear ends.

Which one you recomend and what weight would be great, I know I need 90 weight or so gear oil but what about the motor
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