Re: Straight 40 to thick?
The owners manual states:
SAE 30 32 degrees-120
SAE 20 32-90
SAE 20W 10-80
SAE 10W -10-60
SAE 5W -30-10
In South Carolina I use Shell Rotella 30 weight oil in my V6's. At the time these engines were made multi viscosity oil was available but the engineers choose to recommend straight weight oil. In 1964 I purchased a new GMC 1500 with a 305E V-6 and ran 30 weight oil year round in Massachusetts, put 100,000 miles with a camper and towing an enclosed trailer with my Top Fuel dragster up and down the East Coast, the engine never missed a beat or used any oil.
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Clyde McKaba
Abbeville,SC
1961 GMC Suburban 4WD 305 V6, 4spd
1966 GMC 3/4T P/U 351 V6, Turbo 400,Gear Vender OD
1969 GMC Suburban 1/2T
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