Posting on behalf of a friend.
Engine is a VX 20 XE, its been rebuilt with QED high compression pistons and new rings, yukspeed big wing shallow sump, head has been rebuilt and just recently had 4 new valves on no.1 in an attempt to fix this problem.
Start the car up, runs fine from cold, when it warms you get lots of smoke, burning oil not mixture problems. There's a lot of smoke not just a little and more as you rev it. The engine has been rebuilt to try and cure the problem but still he has it. Compression test has been done and all 4 are spot on, oil pressure was high but reduced thanks to an SBD oil pump kit.