Re: Re: synthetic oil

Posted by Nolan on November 14, 2003 at 04:40:50 from (167.102.133.164):

In Reply to: Re: synthetic oil posted by Ludwig on November 13, 2003 at 06:42:43:

No, synthetic oils are not high in detergent. The AP rating dictates the amount of detergent and other additives they are allowed to have. This is a range and they do not exceed it, no matter how much the marketing guys like to claim they are somehow super detergent. An AP SG oil is an SG oil, regardless of who made it or whether it's a synthetic or not.

Synthetics tend to promote sludge because of their free flowing nature. They will not hold things in suspension like a regular dino juice oil will. That is the reason for the increased sludging. I'm not talking about some huge increase in sludge, especially not the type caused by old Quaker State oils that would react with combustion by products making their own sludge. I'm just talking about the sludge that builds up in the bottom of the pan and on the heads from drop out. It is not a hard caked sludge or varnish either.

This drop out tendency is why synthetics tend to look better in use than a regular dino juice oil does. The dino juice holds the contaminates in suspension, looking quite black and nasty. The synthetic will drop it to the bottom of the pan, and look clearer as a result. The oil will be in better shape as a result of this in fact.

You can watch this yourself if you'd like. Take a drain sample of synthetic oil, place it in a glass jar and set it on the shelf. Take notes of how it looks over the next few days.

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