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Does 964 engine need ZDP in motor oil?

Engine

Vehicle Information: Model: 964; Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 964 engine in a 1987 911 Coupe; Total Mileage: 2,000 since engine rebuild;

I've heard that aircooled Porsche engines require ZDP levels > 0.1 percent additive levels in their motor oil to adequately lubricate valve train parts. I've also read on the Internet that oil manufacturers, including Mobil 1, are reducing the ZDP concentrations below 0.1% to protect catalytic converters. Some aircooled Porsche engines may be underlubricated because of the low concentrations of ZDP, particularly those with 2 valves per cylinder. Should I be concerned with my rebuilt 964 aircooled angine?Thanks for your answer.

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