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Diesel vs gas mechanical question?

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Richard

02-05-2003 17:45:08




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Why is the oil get, and stay so black dirty looking in a diesel, where as an oil change in a gas engine, the oil appears to stay tranparant on the dip stick longer.




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andy

02-05-2003 19:19:36




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 Re: Diesel vs gas mechanical question? in reply to Richard, 02-05-2003 17:45:08  
I think that I might agree with you. Probably due to the fact that gasoline burns cleaner leaving less combustion residue on the cylinder walls which is pulled into the crankcase via the rings. I would think that gasoline is a product of more refining. LPG would even be cleaner than gasoline. Even though the oil may get black quicker does not mean in this case that more wear is taking place. The soot in the oil is probably pretty fine. In general diesels run many more hours than gasoline tractors between overhauls. Probably worst than the fact that the oil gets black in a diesel is the gasoline washing the walls of a gas tractor causing a great deal of ring / cylinder / piston wear. Another thought is the increased compression ratio and all of the blowby coming out of the breather I see on some diesels. The blowby puts all of that soot right in the crankcase. Just my thoughts.

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Mike Aylward

02-05-2003 19:54:35




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 Re: Re: Diesel vs gas mechanical question? in reply to andy, 02-05-2003 19:19:36  
Andy and Richard, one of the main reasons a diesel engine gets blacker is due to the higher detergent oil used in diesel engines. Most of the black is just soft carbon and harmless. This stuff will float harmlessly out the drain hole if kept suspended by the diesel oil. This is the reason I use only diesel oil in all my tractors. If a lower detergent (or non-detergent) oil is used the stuff doesn't get drained out and stays in the engine to cause all kinds of problems. Get that junk out of there and keep it out. Your engine will thank you. Mike

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