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1990 964 exhaust valve carbon

Engine

Model: 964, Year:1990, Mileage:130000, Type of use:Street use only
Hi Chris, Thanks for your reply. I did not find a way to email you directly...Oil consumption has been nominal after about 1000 miles so I feel that the valve stem seals and piston rings are fine. No carbon on the plugs, only on and around the exhaust valves. Break in was not gentle and I was careful to vary engine revs over the entire range from day one. No change in driving style. Porsche engines want to breathe and need to be rev'd. My driving is approximately 400 miles a month on both highway and local roads. No revs past 4K until the engine is up to temp and then usually 4K to 5K when driving. Any comments?

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