Signature Series Protects Turbochargers

The turbocharger/direct fuel injection combo has emerged as automakers’ favored choice for producing powerful engines and meeting government fuel-economy requirements. The increased airflow turbos generate enables an engine to burn more fuel and produce more power, but this power comes at a cost. The tremendous heat and stress turbos create cause some oils to break down and form harmful bearing deposits through a process known as turbo coking. Over time, turbos can suffer reduced performance or fail altogether.

How Turbos Could Slow You Down

The deposits common to turbochargers can lead to:

Blocked oil passages, oil starvation and eventual failure
Reduced turbine speed – resulting in lower boost pressures, reduced performance and poor efficiency
Oil breakdown and oil burning
Expensive turbo rebuild or replacement

The GM Turbo Coking Test

The Turbo Coking Test was designed to simulate the extreme operating conditions of a turbocharged engine. It evaluates a motor oil’s ability to resist deposit buildup in the oil passages and bushings of a turbocharger. Temperature increases within the turbo and the weight of any deposits are recorded.

Signature

Test Parameters

Engine	2012 GM 1.4L
Duration	2,000 cycles of extreme heat soaks – approximately 537 hours
Measures	A motor oil’s ability to resist deposits in a turbocharger’s oil passages and bushings
Simulates	High-heat operation of a turbocharged engine
Requirement	Temperature change within the turbocharger limited to 13 percent

Signature Series protects turbochargers 72% better than required by GM dexos1^® Gen 2¹

The GM Turbo Coking Test requires an oil to limit the temperature change within the turbocharger to 13 percent or less to pass the test. Signature Series limited the temperature increase to only 3.6 percent, controlling heat and proving it protects against deposits common to high-temperature engine environments.

¹Based on independent testing of AMSOIL Signature Series 5W-30 in the GM Turbo Coking Test as required for the GM dexos1 Gen 2 specification.

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