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tucsonjwt · 04-28-2012, 11:26 PM

No. Bottom line - just thickens your oil. I ran straight 40W in my old 73 BB, but I think that might have hastened its cam failure (due to "soft lobes"?), which was common on early 454s.

04-28-2012, 11:26 PM	#11
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,198	Re: High Mileage Oil Treatment No. Bottom line - just thickens your oil. I ran straight 40W in my old 73 BB, but I think that might have hastened its cam failure (due to "soft lobes"?), which was common on early 454s.