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Reply to "Diesel Fleet Fuel Economy Study. AMSOIL synthetic drivetrain lubricants increased fu"

You can ask the Ford employees at Ford's Rawsonville, Michigan fleet maintenance facility that participated in the study if you have doubts.

The Texas State Police have been running AMSOIL 20,000 mile severe service oil and filter changes for the past 10 years without problems. They have around 3000 cars doing this.
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