In 1985 I worked with my father to replace the heads and make other repairs needed to put a 1972 Fiat Sport Spider back on the road. The experience taught me why, in many circles, FIAT stands for, “Fix It Again Tony.” At 17, when I eventually got to drive the car, I experienced firsthand the pride and excitement enthusiasts have in their personalized statements of horsepower and style. I also found out why enthusiasts pay so much attention to every detail about their vehicle, including the level of protection motor oil delivers.

Turbocharger demands on motor oil

Advancements in automotive technology have since driven advancements in motor oil chemistry and have complicated the process of evaluating oil. Due in large part to the ability to offer power and fuel economy, turbochargers have become one of – if not the most – widely used advancements in performance technology. The following are just a sample of turbocharged 2016 makes and models:

• Volkswagen GTI
• Buick Regal
• Subaru WRX
• Ford Fiesta
• BMW 3 Series
• Ford Mustang EcoBoost
• Ford F-150 EcoBoost

When exposed to increased heat, motor oils can form deposits, reducing efficiency and contributing to poor overall performance. Given the

number of vehicles on the road now equipped with turbochargers and other performance-enhancing technologies that increase heat, such as direct injection and variable valve timing , deposit control has taken on increased importance.

AMSOIL goes head-to-head with Royal Purple and Mobil 1

Among auto enthusiasts, three brands often dominate the conversation about motor oil protection: AMSOIL, Royal Purple and Mobil 1. Each has a history of providing solid protection. Yet, wherever enthusiasts gather, be it in online forums or car shows, when the topic of serious motor oil protection is discussed the debate often turns to which brand offers more protection. Recently, AMSOIL enlisted an independent, third-party lab to compare the three brands in an industry-standard test that focuses on protecting turbochargers.

Independent test measures turbo deposits

The TEOST 33C test is an American Society for Testing and Materials (ASTM) bench test that simulates turbocharger operating conditions and, according to the ASTM, the test method “is designed to predict the high temperature deposit forming tendencies of an engine oil.” To meet the API SN Resource Conserving and ILSAC GF-5 motor oil specifications that are often recommended by vehicle manufacturers, a 5W-30 motor oil must limit total deposit formation to 30 mg or less.

The following graph shows the test results from the independent, third-party lab. This industry-standard test shows AMSOIL Signature Series 5W-30 Synthetic Motor Oil prevents deposits 4X better than Mobil1® Extended Performance and 3.6X better than Royal Purple®.

The results show AMSOIL Signature Series 5W-30 held deposits to well under the 30 mg limit recommended by vehicle manufacturers. Test results represent the formulations as they were available to consumers in April 2016. Formulations were coded to eliminate bias during testing, and samples were tested in random order. An appropriate number of trials of each oil were run to produce results at or above the 95 percent confidence level when compared to AMSOIL Signature Series 5W-30 Synthetic Motor Oil.

Hopefully this information adds a few more data points to the discussion when enthusiasts and people that care about what they drive compare notes on three of the leading brands that offer serious protection for the cars and trucks they take pride and passion in.

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