Use WD-40 directly into the air intake on a diesel for starting, it works and won't strip the lubrication off the cylinder walls like ether does. I learned about that with a lawn mower. After one or two seasons it lost compression because the cylinders were scored badly.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!