on my 84 500sec with 135k on it, it will tick in the hydraulic valve adjusters with 15w40 rotella til the car has 1500 on the oil change. with 10w30 mobil one it never ticks.

maybe you should try some 10w30 mobil one.

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.