amsoil Archives

Exploring Causes of Motor Oil Consumption

Reasons and Causes Motor Oil Consumption?

Ed Newman |Oct 14, 2016 9:37 AM

Everyone 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. and Check your tires too!!

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.

Local note: From our Sioux Falls store staff we hope you enjoy Ed’s blog. We will be posting more from his decades in the industry. It’s our quest to serve and inform Sioux Falls drivers and auto enthusiasts to the highest degree and always provide products which not only out perform but solve problems just the same.

I personally have lessened oil consumption in my own vehicles as well as countless customers using the AMSOIL Engine Flush.

A Look at Today's Gasoline Issues and Quality

Gasoline is the source of your vehicle’s power – and many of its problems.

Gasoline quality is vital, yet often overlooked.

Dan Peterson - AMSOIL Technical Development

AMSOIL’s Dan Peterson.

Dan Peterson | VICE PRESIDENT, TECHNICAL DEVELOPMENT

Gasoline’s influence on our lives can’t be overstated. Remember how the gas lines of the 1970s disrupted daily life? People waited hours to fill up – if there was any gas available once they finally pulled up to the pump. Odd-even rationing dictated that motorists could only fill up on even-numbered days if the last digit on their license plate was even. The fallout of the gas shortages of the 1970s was a driving force behind the government mandates to increase fuel efficiency that continue to influence the industry today.

A few years ago, when gas hit $5 a gallon in some places, stories populated the Internet and airwaves about people willfully losing money to sell their giant SUVs in favor of small, fuel-efficient cars. Some people even took a loss on their houses in the suburbs to move closer to work.

In many ways, gasoline makes the world go ‘round, yet many of your customers likely know almost nothing about it, including the negative effects it can have on their vehicles.

Gasoline is distilled from petroleum crude oil. Typically, a 42-gallon barrel of crude will yield about 19 U.S. gallons of gas. The final blend can contain hundreds of different ingredients, among which are detergency additives designed to prevent harmful deposits from forming inside your engine.

In 1995, the EPA introduced its minimum gasoline detergent standard, known as lowest additive concentration (LAC). The intent was to ensure that all gasoline available in the country contained sufficient detergent additives to combat formation of deposits that reduce fuel efficiency and performance.

The widespread use of electronic fuel injection in the 1980s was a driving force behind the introduction of the LAC mandate. It quickly became evident that fuel injectors were especially sensitive to deposits, and the gasoline of the time didn’t contain sufficient detergents.

Deposit formation on the injector tips disrupts the spray pattern, which reduces fuel economy and results in less-efficient combustion. This contributes to increased tailpipe emissions since unburned gasoline can escape the combustion chamber on the engine’s exhaust stroke.

Deposits can also form on the intake valve, piston crown and in the ring grooves. They can prevent the intake valve from closing completely, reducing engine compression and horsepower. Deposits in the ring grooves can lead to ring sticking, which also reduces engine compression since a stuck ring won’t seal the combustion chamber completely. Piston crown deposits act like a sponge that soaks up gasoline. This can result in preignition, where the fuel/air mixture ignites sporadically, reducing performance and potentially damaging the engine.

Many automakers today don’t think the LAC mandate goes far enough. In fact, many gasoline marketers have reduced detergent levels by up to 50 percent, according to www.toptiergas. com. TOP TIER Detergent Gasoline is a performance specification designed by several of today’s top automakers.

Today’s vehicles run even hotter than they did in 1995. Since then the number of engines that use turbochargers, which increase heat, has grown substantially. So, too, has the number of vehicles that use direct fuel injection, which locates the injectors directly in the combustion chamber, exposed to intense heat. Plus, injectors today are more highly engineered with tighter tolerances, meaning even minute deposits can interfere with performance.

Gasoline is the source of your vehicle’s power – and many of its problems if you don’t perform proper maintenance. We formulate AMSOIL P.i.® to be one of the most potent additives on the market. It contains a very high dose of fuel detergents proven to combat the problems associated with gasoline, keeping injectors clean and functioning properly. In fact, testing showed dirty injectors returned to >95 percent flow after only one tank of gas treated with P.i. Just take a look at the dramatic before/ after images above.

As vehicles become more sophisticated and sensitive to gas quality, make sure you understand the importance of maintaining them with a quality fuel additive. AMSOIL provides solutions to problems you may not even be aware of.

Let AMSOIL Sioux Falls be your gasoline fuel additive source! Depend on us for the best products which will always be the state of the art for all Nebraskans! Thank you for your business. We love being here in Sioux Falls!

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