Oil Problem
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
Oil Problem
I think my truck stopped using oil to lube the engine. Have 2,000 miles on current oil. Pulled the dipstick to check the level and the oil still looks as clean as the day I put it in. Not bad for an almost 100,000 mile engine.
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
No I'm deleted and I'm imagine that's why the oil looks so good. I checked it at 500 miles and it was clean. Figured it would be pretty dark by 2000 miles but was very surprised to see it so clean.
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Laughing Gas
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From: Gig Em, Tx
I'll have to watch that. Mine never seems to lose the typewriter sounds.
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Post Fiend
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From: Greenwood, SC
I don't understand how soot can get into the oil/crankcase. Is it getting by the piston rings?
I always thought the oil turned black because the temps in the hot zones were so high. Like cooking the oil at the turbo or in,the heads? There's no oil in the actual egr unit is there? Does soot leak by the valve seals? I'm not experienced with engine tear down so I really don't know just how much blow by or leaking by the rings or seals there is. I guess ideally there wouldn't be any leaking of fuel or air by the rings so I figure there must be VERY little.
I always thought the oil turned black because the temps in the hot zones were so high. Like cooking the oil at the turbo or in,the heads? There's no oil in the actual egr unit is there? Does soot leak by the valve seals? I'm not experienced with engine tear down so I really don't know just how much blow by or leaking by the rings or seals there is. I guess ideally there wouldn't be any leaking of fuel or air by the rings so I figure there must be VERY little.
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We're going to need someone more knowledgeable about this than I am but I'm going to type my thoughts anyways. I'm going off of what I've always heard which has also made sense to me that it's soot darkening the oil.
I don't know how the soot gets into the oil but it has to be from blowby. Two reasons I can think of why it's dark so fast is it's mixed with the existing dirty oil that doesn't drain and the fresh oil over a short time is collecting various soot particles from the engine.
In addition to that is the EGR. It doesn't have oil but it's forcing exhaust back into the cylinders. We know exhaust sent to the EGR contains soot because soot builds up in the EGR if the engine isn't worked hard often enough. Without EGR it makes sense the oil would remain cleaner longer because the engine is exhausting most of the soot the first time instead of ingesting it a second time.
It would be great if someone could explain this better or correct me entirely.
I don't know how the soot gets into the oil but it has to be from blowby. Two reasons I can think of why it's dark so fast is it's mixed with the existing dirty oil that doesn't drain and the fresh oil over a short time is collecting various soot particles from the engine.
In addition to that is the EGR. It doesn't have oil but it's forcing exhaust back into the cylinders. We know exhaust sent to the EGR contains soot because soot builds up in the EGR if the engine isn't worked hard often enough. Without EGR it makes sense the oil would remain cleaner longer because the engine is exhausting most of the soot the first time instead of ingesting it a second time.
It would be great if someone could explain this better or correct me entirely.
Thread Starter
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
We're going to need someone more knowledgeable about this than I am but I'm going to type my thoughts anyways. I'm going off of what I've always heard which has also made sense to me that it's soot darkening the oil.
I don't know how the soot gets into the oil but it has to be from blowby. Two reasons I can think of why it's dark so fast is it's mixed with the existing dirty oil that doesn't drain and the fresh oil over a short time is collecting various soot particles from the engine.
In addition to that is the EGR. It doesn't have oil but it's forcing exhaust back into the cylinders. We know exhaust sent to the EGR contains soot because soot builds up in the EGR if the engine isn't worked hard often enough. Without EGR it makes sense the oil would remain cleaner longer because the engine is exhausting most of the soot the first time instead of ingesting it a second time.
It would be great if someone could explain this better or correct me entirely.
I don't know how the soot gets into the oil but it has to be from blowby. Two reasons I can think of why it's dark so fast is it's mixed with the existing dirty oil that doesn't drain and the fresh oil over a short time is collecting various soot particles from the engine.
In addition to that is the EGR. It doesn't have oil but it's forcing exhaust back into the cylinders. We know exhaust sent to the EGR contains soot because soot builds up in the EGR if the engine isn't worked hard often enough. Without EGR it makes sense the oil would remain cleaner longer because the engine is exhausting most of the soot the first time instead of ingesting it a second time.
It would be great if someone could explain this better or correct me entirely.
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cetane anyone ??
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
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