Excessive BLUE smoke, but only on some days. Today was one of them. Love the car (82 300SD), but this makes me want to park it. I've done it all - air filter, checked the timing, valve adjustment, use an additive always, change the oil every 3k, use quality b20, etc, etc. It won't do it for weeks, then it's bad for a day, maybe two, then it's okay again. All valve guides and seals were replaced 70k ago with valve job. I've decided the turbo needs to be rebuilt - or at least, that's what I see as the next thing to try - car and turbo have 253k on them. Does anyone know were I can send one (I have an extra) to get rebuilt? Thanks.