Dave, in my cam failure thread you noted a change to a hydraulic roller cam. Was it noisy @ startup with the 10w/30, 10w/40 etc oils you used? What brand cam and lifters is it? I notice extra valve train noise at cold start-up with my car also. I've never run 5w/30 but have noticed that the noisy period with 20w/50 was louder and longer than any other oil I used. I put that off to it being thicker and harder to pump through the system when cold. Did you find the Mobil 1 caused or increased any oil leaks?
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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