Amsoil 7500 series extended drain study

AMSOIL XL-7500 Synthetic Motor Oils gave 12,000 miles service with excellent wear control and fluid integrity, showing 7,500-mile intervals are a piece of cake for these oils.

AMSOIL, Inc. and Lake Superior College of Duluth, Minnesota conducted a six-month study comparing the wear protection of AMSOIL XL-7500 Synthetic Motor Oil used for extended drain intervals to the wear protection of conventional motor oils used for conventional drain intervals. A report was issued on December 8, 1998 showing that AMSOIL XL-500 Synthetic Motor Oils used at extended drain intervals provide better wear protection than conventional oils do at conventional drain intervals.

Protocol

Six automobiles belonging to students were selected for the study. All were 1994 models or newer with starting mileage between 10,000 and 75,000. Each had 2,800 to 3,200 miles of use since the last motor oil change. Each was operated an average of 750 miles a week. The control group contained three vehicles using conventional petroleum motor oils changed at 3,000-mile intervals. The test group contained three vehicles using AMSOIL XL-7500 Synthetic Motor Oil changed at 7,500-mile intervals.

Baselines were established for each vehicle using a standardized protocol, including evaluation of used oil condition. After establishing baselines, the oil and oil filter of each vehicle were replaced and each vehicle was provided with two quarts of make-up oil of the brand and viscosity grade installed in the engine.

Vehicle owners were instructed to have preventive and general maintenance performed on the vehicles as needed, with the exception of oil and filter changes, which are done at intervals prescribed by the study and performed by study personnel. Oil samples were also taken from all vehicles at 3,000-, 6,000- and 9,000-mile intervals, and one was taken from the test vehicles at the 7,500-mile interval. Two of the test vehicles continued using the AMSOIL product for a total of 12,000 miles each.

Method

The rate of internal engine wear was evaluated through spectrochemical analyses of used oil, as determined by levels of iron, aluminum, lead and copper, using the ASTM D5185 test method. Samples were also evaluated for viscosity (ASTM D445) and Total Base Number (ASTM 2896). Oxidation/nitration changes and the presence of concentration of water, glycol, fuel, solids and additional elements were monitored.

Results

Measures of iron, aluminum and lead showed lower wear rates in the vehicles using AMSOIL XL-7500 Synthetic Motor Oils for extended drains than in vehicles using conventional oils for 3,000-mile drain intervals, with rates as much as 80.9% lower (iron) for the AMSOIL lubricated vehicles.

The overall viscosity change for the control vehicles was a 15.41% increase. The overall change for the AMSOIL vehicles was a 7.38% increase, less than half that of the conventional oil.

The conventional oil lost an average of 68.3% TBN, while the extended drain AMSOIL group lost an average 36.1% TBN than the control group did, though the AMSOIL-equipped vehicles used extended drain intervals while the conventionally-equipped vehicles did not.

The extended drain AMSOIL-equipped vehicles also generated 68.6% less (by volume) oxidation contaminants and 65.9% less (by volume) nitration contaminants than the conventionally equipped vehicles.

Discussion

"In general," the study concludes, "the data suggest the AMSOIL product is capable of providing service for a period beyond the 7,500-mile interval for which it was designed. Utilization of those intervals offers no compromise in the areas reviewed in this evaluation."

In fact, with drain intervals up to 12,000 miles, AMSOIL XL-7500 Synthetic Motor Oil provided less wear, less viscosity changes, less TBN depletion and suffered less contamination than conventional oils changed at 3,000-mile intervals! AMSOIL proved to be the better oil, even after four times the length of service!

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Synthetic XL-7500 Motor Oils

AMSOIL XL-7500 Synthetic Motor Oils are specially formulated to provide outstanding wear protection, power, fuel economy and performance for 7,500 miles or six months of service. With AMSOIL XL-7500 Synthetic Motor Oils, motorists driving 15,000 miles a year need only change their oil twice annually. AMSOIL XL-7500 Synthetic Motor Oils offer a high degree of convenience and savings through their ability to perform and protect engines for extended periods.

PRODUCT DESCRIPTION
AMSOIL XL-7500 Synthetic Motor Oils are specially formulated to provide outstanding wear protection, power, fuel economy and performance for 7,500 miles or six months of service. With AMSOIL XL-7500 Synthetic Motor Oils, motorists driving 15,000 miles a year need only change their oil twice annually. AMSOIL XL-7500 Synthetic Motor Oils offer a high degree of convenience and savings through their ability to perform and protect engines for extended periods.

Thermal and Oxidative Stability
AMSOIL XL-7500 Synthetic Motor Oils eliminate the need for frequent oil changes. Outstanding thermal and oxidative stability ensures long- term physical and chemical integrity of the oils after exposure to engine operating temperatures.

Low Volatility
Low volatility makes AMSOIL XL-7500 Synthetic Motor Oils highly resistant to oil consumption. The oils continue to lubricate, maintain fuel economy, and reduce exhaust emissions for an extended drain interval.

Shear Stability
Superior shear stability ensures AMSOI L XL- 7500 Synthetic Motor Oils maintain protective viscosity throughout extended service life. The oils continue to protect engine components from metal-to-metal contact and wear, especially in high temperatures.

High Temperature Performance
AMSOIL XL-7500 Synthetic Motor Oils offer outstanding high-temperature engine protection and performance. Engines operate in optimal temperature range in high-stress conditions. In high-temperature operations, AMSOIL XL-7500 Synthetic Motor Oils provide clean, dependable lubrication and protection.

Low Temperature Performance
Wax-free synthetic stocks ensure the rapid flow of motor oil throughout the engine after startup, protecting engines from wear. AMSOIL XL-7500 Synthetic Motor Oils' low temperature fluidity also helps engines start dependably year-round and significantly improves cold temperature fuel economy.

Fuel Economy and Power
AMSOIL XL-7500 Synthetic Motor Oils enhance fuel economy and powerful performance. Low coefficients of friction ensure the maximum delivery of engine power with minimal frictional losses.

Corrosion, Rust and Foam Control
AMSOIL XL-7500 Synthetic Motor Oils seal out rust, neutralize acids and resist foaming. Rust inhibition is an especially important feature for engines subject to frequent short-trip operations or for stored engines. Acid neutralization protects engines from damage caused by corrosive by-products of combustion. Foam resistance ensures protection against metal-to-metal contact and wear.

Additive Durability
AMSOIL XL-7500 Synthetic Motor Oils contain top-quality additives designed for long-term performance. AMSOIL XL-7500 Synthetic Motor Oils protect engines from wear, corrosion, deposit accumulation and sludge buildup. The long-life additives in AMSOIL Synthetic XL-7500 Synthetic Motor Oils are designed to keep engines clean and protected for 7,500 miles or six months, whichever comes first.

MIXING AMSOIL
AMSOIL XL-7500 Synthetic Motor Oils are compatible with conventional petroleum oils. However, AMSOIL does not recommend using a mixture of XL-7500 oils and conventional oils for 7,500-mile or six-month drain intervals. Engine oil additives are not recommended for use with AMSOIL XL-7500 oils.

SERVICE LIFE
In gasoline-fueled passenger vehicles in normal or severe service, change AMSOIL XL-7500 Synthetic Motor Oils at 7,500-mile or six-month intervals, whichever comes first.

Change aftermarket or OEM full flow oil filters with every oil change.

Premium quality AMSOIL Full-Flow Oil Filters are recommended for use with AMSOIL XL-7500 Synthetic Motor Oils, and may be used for 7,500 miles or six months, whichever comes first

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