[notfarnow]

My neighbors have a '72 Westfalia with a single port 1600 from a bug. About 3 years ago, they were on a kick to get it all fixed up. I did the brakes, some electrical work and rebuilt the engine for them.
Then it sat in the yard until this spring. I was actually a bit irked, I had done the work pro-bono to be neighborly, and they just let it sit and seize up again.

This spring they decided they wanted to sell it, so I said I'd give it a going over first. I'm not going all-out, but I'd like to get it so someone could drive it up and down the road.

I've got the brakes all apart now and am also doing a bit of bodywork. However, the motor has me stumped. It runs like a top, but is burning oil once it's warmed up. If I give it a shot of gas, I get a noticeable puff of blue smoke. It didn't do this 3 years ago, and it wouldn't have covered 50 miles since then.

I'm thinking the oil rings may be seized, but would the engine still run normally? If the rings are seized, what can I do (short of pulling the engine) to free them? Any have success with canned miracle cures?