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1987 944 Turbo Reduced zinc & phosphate in modern oils

Engine

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 52000;

The EPA has forced oil manufacturers to remove zinc and phosphate from all modern oils. Supposedly, all engines prior to 1990, require these minerals for non-roller lifters. How does this affect the engine in a 944 Turbo? I have a 1987 and a buddy has a 1986.

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