It still can be, it works wonders on an older diesel engine.
I bought an old van last year which had problems with the diesel siphoning back to the tank and airlocking the system.
A good squirt of WD40 while cranking was enough to get it going if it did this.
Quote:
Originally Posted by The Continental
WD40 used to be able to be used as starting fluid, but then the formula was changed.
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