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THE PETROLEUM QUALITY INSTITUTE OF AMERICA​

The independent resource for information and insights on the quality and integrity of lubricants in the marketplace

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Mile Master SAE 15W-40 API CI-4 Motor Oil

Test Results and PQIA Assessment

Product: Mile Master Motor Oil
Viscosity Grade: SAE 15W-40
Labeled: API CI-4, CH-4/SL
PQIA Note: Although still active, API CI-4/SL are older Service Categories. Always consult your owner’s manual for proper lubrication selection.
Distributed By: MileMaster Lubricants, Houston, TX

Purchased at: Angola, NY
Date of purchase: 6/22/2019
Website(s): www.citgolubes.com

Company Information:
CITGO Petroleum Corporation, based in Houston, is a refiner, transporter and marketer of transportation fuels, lubricants, petrochemicals and other industrial products. The company is owned by CITGO Holding, Inc., an indirect wholly owned subsidiary of Petróleos de Venezuela, S.A., the national oil company of the Bolivarian Republic of Venezuela. For more information, visit www.CITGO.com.

Front Label
Back Label

Test Results and PQIA Assessment

Assessment Summary

The results of the tests conducted on this sample meet the SAE J300 specifications for the SAE Viscosity Grade listed on the product label, and are consistent with the listed API Service Categories. 

Although laboratory tests alone cannot be used to establish if engine oil meets an API Service Category, they can be used to determine if it doesn’t. The test results and PQIA assessment relates ONLY to the sample tested and the tests conducted.

Phyisical Properties

Elemental Analysis

Labeling

ViscosityStandardMileMasterStatus
Viscosity 100°C cSt12.5 to <16.314.8Check
Viscosity 40°C cSt105Check
Viscosity Index146Check
Cold Crank Viscosity at -20°C7,000 Max5,302Check

Viscosity is a critical measure that determines how thick or thin a lubricant is. Viscosity is measured by several methods to determine the behavior of motor oil during cold startups and while hot at operating temperatures. Motor oils must meet Society of Automotive Engineers (SAE) J-300 standards to conform to a specific viscosity grade. >>More

Viscosity Index measures the change in viscosity with temperature. Viscosity Index improver additives are used to optimize viscosity at different temperatures. >>More

Detergent Additives and Total Base Number (TBN)StandardMileMasterStatus
Calcium (ppm)1,074Check
Magnesium (ppm)1,081Check
Sodium (ppm)1Check
Barium (ppm)<1Check
TBN, mg KOH/g (ASTM D2896)8.79Check

Detergent additives help to keep metal surfaces in an engine clean by controlling formation of deposits (i.e. sludge, varnishes). Such deposits can harm an engine by clogging oil passages that lubricate an engine, increase wear and reduce engine performance. A blend of calcium and magnesium-based detergents are most commonly used. A shift towards increased use of magnesium was required to address the needs of new gasoline direct injected (GDI) engines. >>More 

Detergent additives also help prevent corrosive wear by neutralizing acids formed as a by-product of combustion and other processes in an engine. Total Base Number (TBN) is a laboratory test that measures an oil’s ability to neutralize such acids. >>More

Antiwear Additives (parts per million)StandardMileMasterStatus
Phosphorus1,200 Max -a1,237Check
Zinc1,548Check
Molybdenum48Check
Titanium<1Check
Boron<1Check

Antiwear (AW) additives help protect metal surfaces against impact friction and wear between moving parts in an engine. Such additives work by adhering to metal surfaces and forming a protective film between moving surfaces. The most widely used AW additive are chemistries containing phosphorus and zinc. Some lubricant manufacturers also employ the use of antiwear additives containing boron, molybdenum and titanium among others.

Antiwear additives are multifunctional in that they also act as corrosion inhibitors and, more significantly, antioxidants.

For more on AW additives and other functional and performance additives used in motor oil… >>More

Contaminants (parts per million)StandardMileMasterStatus
Silicon*5Check
Silver<1Check
Aluminum<1Check
Chromium<1Check
Iron<1Check
Nickel<1Check
Lead<1Check
Antimony<1Check
Tin<1Check
Copper<1Check
Cadmium<1Check
Vanadium<1Check
Potassium2Check
Manganese<1Check
Lithium<1Check

Although motor oil is subject to contamination from a number of metals related to wear, and abrasive material in the form of silicon when in use, new motor oil typically does not contain such metals at any appreciable levels. The presence of these metals (iron, aluminum, copper, lead, nickel, tin, sodium, potassium, etc.) in a new motor oil can indicate contamination from used oil, rust, abrasives, and others introduced to the product during blending, packaging, and/or transportation. Such contaminants can be harmful to an engine. Some can also be part of an additive, such as copper or sodium, but these are not often seen.

*Whereas silicon in the form of polydimethylpolysiloxane is commonly used as an antifoamant in motor oil, such use typically does not exceed 10ppm in new motor oil. Levels much above indicate possible contamination with abrasive material, silicone-based sealers, and/or transformer and hydraulic oil.

Note1: Standards are established by API, SAE and others.
Note2: Test Method for metal analysis is ASTM D5185.

  1. This specification is expressed to one significant figure, therefore results up to 1,249 are considered on specification.

Viscosity is a critical measure that determines how thick or thin a lubricant is. Viscosity is measured by several methods to determine the behavior of motor oil during cold startups and while hot at operating temperatures. Motor oils must meet Society of Automotive Engineers (SAE) J-300 standards to conform to a specific viscosity grade. >>More

Viscosity Index measures the change in viscosity with temperature. Viscosity Index improver additives are used to optimize viscosity at different temperatures. >>More

Detergent additives help to keep metal surfaces in an engine clean by controlling formation of deposits (i.e. sludge, varnishes). Such deposits can harm an engine by clogging oil passages that lubricate an engine, increase wear and reduce engine performance. A blend of calcium and magnesium-based detergents are most commonly used. A shift towards increased use of magnesium was required to address the needs of new gasoline direct injected (GDI) engines.

Detergent additives also help prevent corrosive wear by neutralizing acids formed as a by-product of combustion and other processes in an engine. Total Base Number (TBN) is a laboratory test that measures an oil’s ability to neutralize such acids. >>More

Antiwear (AW) additives help protect metal surfaces against impact friction and wear between moving parts in an engine. Such additives work by adhering to metal surfaces and forming a protective film between moving surfaces. The most widely used AW additive are chemistries containing phosphorus and zinc. Some lubricant manufacturers also employ the use of antiwear additives containing boron, molybdenum and titanium among others.

Antiwear additives are multifunctional in that they also act as corrosion inhibitors and, more significantly, antioxidants.

For more on AW additives and other functional and performance additives used in motor oil… >>More

Contaminants: Although motor oil is subject to contamination from a number of metals related to wear, and abrasive material in the form of silicon when in use, new motor oil typically does not contain such metals at any appreciable levels. The presence of these metals (iron, aluminum, copper, lead, nickel, tin, sodium, potassium, etc.) in a new motor oil can indicate contamination from used oil, rust, abrasives, and others introduced to the product during blending, packaging, and/or transportation. Such contaminants can be harmful to an engine. Some can also be part of an additive, such as copper or sodium, but these are not often seen these days.

*Whereas silicon in the form of polydimethylpolysiloxane is commonly used as an antifoamant in motor oil, such use typically does not exceed 10ppm in new motor oil. Levels much above indicate possible contamination with abrasive material, silicone-based sealers, and/or transformer and hydraulic oil.