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  #21  
Old January 21st, 2020, 03:12 AM
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Quigley Quigley is offline
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Join Date: Mar 2013
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Default Re: New to the Group

As far as oil is concerned the diesel oil up until a couple of years ago was rated CJ and contained enough zinc for flat tappet cams. The newer CK rated diesel oil has most of the zinc removed for the emissions systems on the newer diesels. I was using Chevron Delo and after a conversation with their lab guy have mow switched to Amzoil Z Rod which is the older motor,flat tappet oil. My 2cents worth. Dave
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  #22  
Old January 21st, 2020, 11:10 PM
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jmfurgason jmfurgason is offline
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Join Date: Dec 2019
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Default Re: New to the Group

Thanks guys, appreciate input , trying to keep my 63 in top shape, Will be adding pictures soon ,I sure like my GMC. jm
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  #23  
Old January 22nd, 2020, 06:49 AM
BobBray BobBray is offline
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Default Re: New to the Group

I use Valvoline VR-1 10W-30 racing oil. It's high zinc.
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  #24  
Old January 23rd, 2020, 04:53 PM
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jmfurgason jmfurgason is offline
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Default Re: New to the Group

Hey Bob thanks for comment on Valvoline VR1 10w30 , just ordered a case. I like that it is conventional oil and high zinc.JM
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