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Originally Posted by 1962flattop
Good point. I will make sure I check once I get the truck home.
One last question. As far as I know the engine is all original. That being said, do I need to use a lead additive in the gas? I assume that I use 87 octane. And how about oil? Is there a recommended oil weight and additive to use in the V6. The truck has 75k miles on it.
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87 octane is fine, but not Ethanol. Find a place that has real gas or the alcohol in the ethanol gas will tear up your carburetor. You don't need to add a lead additive.
For the oil everyone has a favorite, but something high in zinc is preferred because it's an older flat tappet engine. I use
Rotella 15w40 Diesel oil with a
boron based friction modifier to keep things spinning smooth and protected.
The GMC engines are based on a diesel design so keep them lubricated and they'll run longer than you will.
One more thing, make sure you get the short oil filter. There's a 6 inch filter and a 9 inch filter. The long one is for a different engine. You want carquest part number 85121 or Fram part number CH106PL.
