1.8t new forged engine oil issue

Hi everyone,

I'm just looking for some advice. My S3 8L is currently being finished from having a forged engine built. At the moment the car is nearly finished but after speaking to place that has built the engine, apparently the oil is finding it's way into the cylinders when warm. So the car smokes when its upto temp, currently it hasnt been run in. Anyway they recommended that the reason why oil is getting into the cylinders is because they have been using fully synthetic oil and will now use mineral oil to stop this from happening.

Now to me this doesn't sound correct, am I right?

Thanks