Re: 1972 GMC oil
People can argue all day about which brand oil is best, but in my opinion any decent oil will work fine. The important thing is to change every few thousand miles or few months and don't let it get low on oil. I don't see a lot of reports of engine failure due to oil problems, it's mainly when it runs out of oil.
EARNHARDT#3, I totally agree with your signature about hating to hear somebody call a distributor a "dizzy". In over 20 years as a professional auto tech, I have never heard another person in the business call it that. I've only seen it in forums.
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