you may be using too heavy of oil. on my 84 500sec when i used rotella it would tick for a good ten minutes until i had maybe 1500 miles on the oil. i switched to mobil 1 10w30 and it stopped.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.