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When all that has been checked there is another condition that will cause oil on the spark plug threads. Its oil leaking past the valve guide seals. All of my V8's had this problem of oil on the threads until I changed the seals. The oil is making its way from inside the engine to the plugs. My consumption before replacing the seals was on the order of 1 quart every 1-2k miles. After replacement zero consumption and the pluds dried up.
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I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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