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why dino oil might not go the years
Posted by Dean (more from Dean) on Tue, 17 Jun 2003 17:43:41
In Reply to: Re: how to avoid sludge before it happens ?, Aaron Govatos, Tue, 17 Jun 2003 14:18:36
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You have to remember that the engines are not the same as the ones from the stories about those with dyno that ran forever. Folks used to think that the turbo bearings were the hot spot in the engines. Water cooled turbos helped with that. But to improve combustion efficiency, the top compression ring has been moved up much closer to the top of the piston. This area thus gets less cooling and is much hotter. This is where oil wil break down and coke. The result is stuck rings, increased wear, lower compression and blow by. That is hard on the oil too. The blow by gasses can cause oil breakdown.
So don't assume that dino oil will work out well over the years. And I expect that when crusing, that your 2.3L NA pistons will run hotter than a 2.L turbo as your compression ratio is higher than in the turbo.
Most of the engines that sludge up are the 2.3L N/A engines. I think that the turbo owners simply are more into things mechanical and take better care of things. And there is some crappy dino oil out there.
posted by 66.139.12...
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