Extended Oil Drain Intervals and Carbon Buildup
Many people believe that extended oil drain intervals will lead to carbon buildup inside the engine. The truth of the matter is, carbon is not a big problem when it comes to oil change intervals. Your oil filter will filter out any carbon in the engine oil. But don’t take my word for it, here is a statement by the guys who actually test used oils. “Carbon isn’t usually a big problem. Most of the time it’s big enough the oil filter catches it.” Ryan Stark Blackstone Labs. Blackstone Labs is second to none in the used oil analysis industry.
The fact is, a good oil filter will catch and filter out any carbon that may enter the engine. A good oil will suspend contaminants and allow the filter to catch them.