I've exhausted my research and need opinions.
I have an 87 Suzuki Samurai sporting a 1.6 VW diesel. I installed the '84 1.6 NA myself about 12-13 years ago. Just after a ring job, I sold the vehicle. That was 11 years ago. I loved that little Zuk and missed it terribly. Fortunately for me, I was given the opportunity to buy it back, and I brought it home about 6 months ago. New owner added an '86 hydraulic turbo head and T3 turbo, boost and EGT gauge, 2" exhaust and external oil cooler. Very nice setup. Runs very well. Yes, it's an NA block with a turbo head and turbo. I watch the EGTs closely, but never touch 1400.
I've checked and adjusted timing. Right now, it's at 1.05. GPs are new. Injectors have been rebuilt and pop and spray equally at 155 or thereabouts. Runs like a top. Starts easily (maybe a little wobbly until warmed up). But it is smoking at idle and uses a ton of oil. I went through 2.5 gallons of Rotella T4 in just under 3k miles. Smoke is white/blue. Come to a traffic light, and it smokes. Embarrassing amounts sometimes. Pull away, all clear. Stop at drive through ... smoke. Gotta shut down at the window. And then sometimes it just sits and purrs. For example, I answered a call yesterday, pulled over to talk, and the little diesel idled nice and smoke free for a 5-minute conversation.
From the reading I've done, I'm either looking at valve stem seals or turbo seals. Those that say valve stem seals strongly recommend rebuilding the head. Those that say turbo seals recommend a rebuild kit, no big deal.
Given my symptoms, what should I do?