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rotorwrench · 11-27-2019, 01:37 PM

The oil is doing what it is designed to do by holding particulate in suspension so that it doesn't form sludge in the engine. Good filtration helps to clean a lot of this stuff out but it depends on the type of filtration the engine is equipped with.

An engine that has run a while with low or no detergent levels in the oil will get dark quickly from all the sludge build up already in the engine. Engines with carburetors don't run as efficiently as modern fuel injected engines so it's not uncommon for the lubricant to darken with the extra contaminants that come from inefficient combustion and or worn compression rings.

Lubricants designed for diesel burning engines generally don't have the same additive package as the lubricants designed for gasoline burners. The oil for diesels have a lot more detergent additives than gasoline burning vehicles.

11-27-2019, 01:37 PM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,432	Re: Rotella T4 oil, dirty oil The oil is doing what it is designed to do by holding particulate in suspension so that it doesn't form sludge in the engine. Good filtration helps to clean a lot of this stuff out but it depends on the type of filtration the engine is equipped with. An engine that has run a while with low or no detergent levels in the oil will get dark quickly from all the sludge build up already in the engine. Engines with carburetors don't run as efficiently as modern fuel injected engines so it's not uncommon for the lubricant to darken with the extra contaminants that come from inefficient combustion and or worn compression rings. Lubricants designed for diesel burning engines generally don't have the same additive package as the lubricants designed for gasoline burners. The oil for diesels have a lot more detergent additives than gasoline burning vehicles.