01-18-2002, 05:52 AM
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CC Member
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Join Date: Oct 1999
Location: Georgetown, TX. USA. Little North of,
TX
Cobra Make, Engine: SMC Motorcars 289
Posts: 831
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Not Ranked
289 HiPo
Still breaking the engine in at 104.4 miles.
I understand that you should never use a synthetic oil for breakin.
Using Twin Motorcraft FL1A's and currently Pennzoil 10W40. Going to switch at next change to Valvoline. My Stepfater who is a chemical engineer stated that it used to be (not sure if it's still true) that Pennzoil is "Parrafin" based and could cause the engine to gum over a period of years. Valvoline is (in his opinion) the purest production "standard" motor oil.
I've had great luck in the past with Mobil 1 20W50 in my SHO. 
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Co-founder of the Texas Cobra Club.
Dave "Ren Man"
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