What Causes Motor Oil Consumption?

Motor oilEveryone who owns a vehicle knows you need to regularly check the oil level. (Note: If you do not know this, you’d better go check your oil.)

A certain amount of oil loss is normal due to motor oil volatility – that is, boil-off due to the high-heat conditions inside an engine. I once attended two days of training at a quick lube (part of a major oil company chain) wherein they showed how their conventional oil lost up to 30 percent of its weight and their synthetic only 12 percent in a volatility test. It drove home the message I’d already adopted that synthetics were more resistant to oil consumption than conventional oils. AMSOIL synthetic motor oils are even more resistant to volatility. (Read about AMSOIL performance in the NOACK Volatility Test.)

Volatility isn’t the only reason you need to replenish your oil supply now and then. The problem of abnormal oil usage is far more complicated and, in fact, most of the causes are mechanical, not lubricant-related at all.

One of the major causes is engine leaks. An AMSOIL technical service bulletin titled “The Reasons for Motor Oil Consumption” says:

Some of the many points where external oil leaks may occur include oil lines, crankcase drain plug, oil-pan gasket, valve-cover gaskets, oil-pump gasket, fuel-pump gasket, timing case cover and camshaft bearing seal. No possible source of leakage should be neglected because even a very small leak can cause extremely high oil consumption. For example, it has been estimated that a leak of one drop of oil every 20 feet is approximately equal to a loss of one quart of oil every 100 miles. One way to check for external leaks is to road test the vehicle with a large piece of light-colored cloth tied under the engine. Oil on the cloth will indicate a leak, which should be traced to its source.

I recently burned a lot of cash trying to get an oil leak fixed. The first task is accurately locating the source of the leak. The problem may be front or rear main bearing seals, worn or damaged main bearings, worn or damaged connecting rod bearings, worn or damaged camshaft bearings, worn crankshaft journals, distorted cylinders, worn ring grooves, cracked or broken ring lands, problems with the wrist pins, clogged oil passages or even unequal tightening of bolts.

Sometimes a defective cooling system can cause engine overheating, which may result in localized hot spots in some of the cylinders that can lead to scuffing and scoring of cylinders, pistons and rings, resulting in high oil consumption.

If you really want to sink your teeth into it, causes for oil consumption can include too much oil in the crankcase, worn or broken piston rings, improper valve timing, incorrect oil pressure, piston slap, an internal gasket intake breach, spark knock, aftermarket performance chips and modifications, lugging engines, inappropriate operation of overdrive, leaking turbocharger seals, a restricted air intake and fuel dilution.

In short, few things are as simple as they might initially appear. When all is said and done, however, even though there may be multiple reasons for oil loss, in a mechanically sound engine it boils down to one: oil volatility. In this matter, synthetic motor oil provides better resistance to oil consumption. If you have a mechanically sound engine, you should be using synthetic oil to reduce oil consumption and to protect your investment. In addition to reduced oil usage, synthetics can reduce emissions and improve fuel economy.

During my three decades of writing about oil, I’ve always recommended a synthetic solution.


  1. I couldn’t agree more. Engine oil lubricates different components of the engine and reduces friction among such components to ensure smoother performance. However, engine oil degrades in time due to the generation of extreme heat and should be replaced with suitable substitutes. Synthetic oil could tolerate extreme temperature for longer period as compared to conventional oil. So, use of synthetic oil is more economical and beneficial as compared to it’s counter parts.

  2. Thank you for another excellent blog post. After using Amsoil full synthetics in our late model vehicles for many years, I recently switched to these lubricants in our antique cars as well with some amazing results. In the oldest one, a 1929 Ford with the original power train & mechanical components, this change resulted in the crankcase oil running 28% cooler & the rear differential running 33% cooler compared to conventional lubricants. Although I have no before & after numbers for comparison, I have also noticed that engine oil consumption is also much improved. Oil consumption has dropped significantly in our 1948 Dodge 6 cylinder & 1967 Ford big block V8, both with the original power trains as well. Amsoil makes this enjoyable hobby even more fun & satisfying!

    1. Hi Fred,

      Great story. It sounds like you have an awesome fleet of vehicles. Thanks for trusting our products to protect them!


  3. Cool. I have a 2000 jetta, I have used several difference oil, and every 1750 miles (approximately) my oil get burned away. I have to put 2 bottles of oil just to prevent oil damage. I have 140,000 miles on it and may need tune up. (I also have a check engine light on for main catalyst below threshold bank 1)

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