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OK, quick update on the blue smoke thing. I replaced the cold advance valve (mentioned above) and now the PCV. After driving for a day, the smoke was gone! No more startup smoke. However, just after I told everyone I knew about the fix, the smoke came back last night. Cold start, and there...

lol I meant once I start it to back it out of the garage.

Ok, I just had the cold advance sensor replaced. This WASN'T easy! It was fused. Had to soak in PB Blaster then use a blowtorch. New one is now installed. It seems to have helped but I'll know for sure when I start it in the garage. Here's the only troubling result - of course, the coolant...

Yes, the wait light comes on when cold for about that amount of time. Flashes before a hot start, as expected.

Actually, I'm replacing quite a few parts anyway. I'm in the process of repainting, new doors, top, all new decals, lights, 12 volt converter, etc, etc. The parts are cheap so, without any records, I'd rather just be safe with new parts than sorry. Hopefully, this will solve the problem.

I'm not sure what oil is in it. It is black (not what I'm used to fixing exotic cars), but the consistency feels good. In other words, no viscosity breakdown so I'm assuming it's recent. What oil should I use? I can refer to the manuals but I figured enthusiasts with experience know best.

Thanks again all for the replies! Ok, today was smoke city. I started it and it missed real bad and smoked vigorously - much worse than before. Bluish white smoke. I forced myself to deal with it just to see if it would clear and as soon as it was warm, it purred and the smoke cleared. I...

Ahead of you buddy! I downloaded that on the way to pick up the truck! I going to start with general maintenance, filters, new glow plugs (just ordered) and the thermo switch. See if that solves. My only comfort is that the symptom completely goes away when hot - atypical of leakage as the...

I appreciate the responses. I just got it back so this weekend I'll be replacing various maintenance items like what you listed above. To further explain, the smoke only exists when cold and disappears when the engine is at operating temp (after fan cycles). After about 600 miles, there is...

I'm a new owner of a 1994 M998. Everything is excellent - no leaks, rust, etc. Problem is it smokes a bit at start. Looks like a bluish (oil?) but has a slight hint of white but mostly blue. I have seen youtube vids of trucks stressing in the mud exhibiting the same (if not worse) smoke in...