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Understanding yellow sludge under the oil cap: A simple fixA concerned reader inquired about what could be under his car's oil filler cap. He found a yellow substance resembling butter ...
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Yellow sludge in your engine? Here's what it means and how to fix itA concerned reader inquired about a yellow substance resembling butter found under the oil filler cap in his car. After a brief conversation, he felt more at ease. This phenomenon could also occur ...
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