i have advocated the use of wd40 as a primer on starting engines that have lost their prime. a diesel will run just fine on it if sprayed into the intake directly. i do not advocate it as an aid for difficult cold starting. as far as i know it will start a diesel no better than the regular diesel.

again only as a primer for those who have changed the filters or somehow otherwise lost prime.

the old 6.2 gm diesels didn't have any priming pump so to get one started after a filter change required ingenuity.

wd 40 is no substitute for properly operating glow plugs.

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.

The color....

Build a spud gun, fire it off ether a few times (or, in my case, several hundred times), and then put that force into your diesel and decide... the fastest spritz i can finger an ether can with is enough to propel a potato out of a pvc tube well over 50 yards.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL