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The biggest reason I keep the revs below 4,000 when cold is oil pressure. 20-50 oil is pretty thick when cold, and the pressure will go above what the oil pressure bypass can handle, and leaks from seals can and will happen. Once they start leaking, they keep leaking. When the oil pressure is pegged at the top when at idle, it is smart to delay the fun of higher rpms.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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