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tubman · 01-12-2025, 12:34 PM

Sludge coming out is not a bad thing. If anything, I would run detergent oil and do frequent changes. You may be able to clean more crap out of it. Although I agree with "V8 Bob" about running the thinnest oil practicable, I would go with the 10W-40 for an unknown used engine. I wouldn't worry about the sludge clogging up the engine, as detergent oil is designed to keep it in suspension. Just change it more frequently.

The previous owner may have run non-detergent oil, which is not a good idea.

01-12-2025, 12:34 PM	#7
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 12,143	Re: Engie oil Sludge coming out is not a bad thing. If anything, I would run detergent oil and do frequent changes. You may be able to clean more crap out of it. Although I agree with "V8 Bob" about running the thinnest oil practicable, I would go with the 10W-40 for an unknown used engine. I wouldn't worry about the sludge clogging up the engine, as detergent oil is designed to keep it in suspension. Just change it more frequently. The previous owner may have run non-detergent oil, which is not a good idea.