Please help with VW T5 AXD Transporter engine

After what you are telling me, it would only be checked by the Board and the Bill but the most normal thing is that you leave it like this and throw it as it is because you commented that it started well and worked well it is best to leave it as I think it. The only one that regularly controls the level of water and motor oil and having passes.
All the best.

Look at the butt of the valves, it may be that by there between oil in the cylinders

I see that a year has passed, so I imagine you already found the problem; What was the smoke?

The problem of everything is in the pistons the accommodations of the excessive wear and excessive segments