I just replaced my fuel injectors, and I noticed motor oil on the #1 and #5 injectors when I removed them. The oil was on the area between the threads and the tip of the injectors. What's up with this? Have I got an oil leak inside the head or something?

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'81 300TD turbo <<sold 12/05 to another diesel nut

Burning diesel fuel or veggie oil in the engine? If its veggie oil then could be fouled precombustion chambers in #1 and 5. And have you tried swapping the injectors around to see if the problem travels with them?

Thanks for the reply. Lately I've been running B100 biodiesel about 80% of the time, dinodiesel 20%. I was running straight veggie oil for a while, but not in the past four months or so.

I have not tried swapping the injectors around. This was the first time I ever removed the injectors on the car. I guess I'll pull those two injectors in a couple months and see what they look like.

I do get some whitish-blue smoke on startup that could be some oil burning, but only black smoke while underway, and much less of that with the new injectors (at least one of the old injectors looked like it was a leaker).

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'81 300TD turbo <<sold 12/05 to another diesel nut

Could be wrong but what I'm thinkin is what you've mistaken for engine oil could actually be unburnt fuel residue - indicating spent or stuck-open injector tips pissing fuel into pre-comb chambers that can also have fouled the chambers.

If you swap the injectors and then #1 and #5 remain clean but oily injectors carry the problem with them, then I'd be testing those injector tips.

One caution - pulling and swapping injectors around might require new seals. This will be obvious because fuel will be leaking where injectors fit into the cyl head. Paint mark the suspect injectors too - so you dont lose them swapping em around.