dcarp wrote:I have a 2001 TN75S. The oil in it looks like any other diesel engine after a few hours, black. Anything other than that I would be looking at the oil pressure to see if the oil pump is working.
Also have a TC-29 oil in it reacts the same way.
luke03cr wrote:Oh you would know if your oil pump stopped working because your engine would have done siezed up a long time ago. The cleanliness of the oil depends on severel factors in a diesel engine that dont pertain to your typical gassers. The main factor in darkening of diesel oil is "blow by". Diesel engines usully run double the combustion pressure of a gasser, and since diesel burns black what happens is sum of your combustion gas gets past the rings and into the engine oil. It usully takes my diesel trucks 500 miles or so to start darkening up. This leaking into your oil is enhanced by cold cumbustion temps..i.e. not getting your engine up to operating temps whenevr you use it, which is alway a great way to ensure a long lasting engine bc u burn of water that condensates in the oil and other impurities. Now the fact that u dont seem to have much of that is a indication of a engine in good mechanical shape. Also ur oil filter is a major player, i always recomend ether the good factory replacement or an aftermarket filter that filters down to severel microns.
Cabo wrote:How thick was the "honey"? Maybe full of oil treatment?
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