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Q:

checked oil and it looks thick like sludge this morning ? on 2004 Volkswagen Passat

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
and yesterday while driving oil pressure light came on for a few seconds ?
(1) Answer
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It is critical on those engines that the oil be changed frequently, seen a lot of those engines fail. Get the oil up to operating temperature and change the oil and filter. I would use a WIX or genuine VW oil filter and synthetic oil.