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Old 05-07-2003, 12:53 AM
bill4247 bill4247 is offline
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Join Date: May 2001
Posts: 108
CI4 spec oils (for diesels) like Chevron Delo 400 have a higher detergent content so over time they would clean up sticky lifters. Maybe that's what happens. I use it in my 72 4.5 and it has cleaned it up the engine very nicely. The first time I put it in it got black immediately so I think it picked up a lot of gum and soot quickly. Mobil 1 is probably a more effective lubricant so it's a tradeoff.
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