It’s been drummed into us by car dealers and car mechanics to do an oil change every 3000 miles or 3 months but an oil change that frequently is seldom what the car manual recommends. Late model cars and trucks often have oil-life monitors and newer oil and engine technology that can extend service intervals out to 7,500 miles with regular oil.

A modern engine records speed and idling time and compares it to the miles driven to calculate when to get an oil change. The interval for the best time to change your car’s oil is then dependent on how you drive and the conditions you drive in. The oil-life monitor tells you when to get an oil change for the best protection of the engine and not waste oil unnecessarily on a fixed schedule.

 

If the monitor records that you warm up the engine oil and you accelerate gently until at operating temperature, then an oil change interval of 5,000 or 7,500 miles is common.

If it records a cold start and hard acceleration onto the highway with high speeds, then you can expect an oil change service light to alert you sooner.

Some cars display this information on the dashboard as a percentage of oil life remaining. Some have a combination warning light that could display a number of service codes requiring attention. Cars having navigation screen features may need accessing service recommendations as part of the screen menu. Resetting the “Change Oil Now” message can be a challenge and perhaps only available to an authorized service person who has the right code reader and reset knowledge.

Some high end vehicles like Mercedes-Benz, Porsche, Audi, and BMW recommend oil change intervals at 10,000 miles or more. This is usually due to the use of synthetic oil, which doesn’t break down as easily as regular oil. In any case it is best to follow the manufacturer’s recommendation for the proper oil change interval, taking into consideration your driving conditions or the presence of an oil-life monitor.

So what turns fresh oil from golden to brown or black in a couple months?

Combustion of gasoline in the cylinder chamber leaks about 2% - 10% of the combustion gases past the rings into the crankcase, depending on the age of the engine. Some of it is unburned hydrocarbons. Some of it is carbon. The PCV system removes most of the gaseous blowby; the "hard stuff" stays in the oil. This hard black carbon is harder than iron or steel in the engine and harder than the ring bearing material causing added wear if not removed.

Condensed moisture from the intake air mixed with combustion gases form acids and a sludgy non-lubricating crud builds in the engine causing the oil to change color. Filters help remove this sludge which is why you should change the filter when you get an oil change.

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