I have several engines here I have changed which have been using Magnatec and they are smokey old things most with under 150k on them. There is another Magna Wrecker I sell a lot of motors to which have commented the same thing.

Have no idea why but for some reason motors with Magnatec in them seem to start blowing stem seal smoke, perhaps something in the oil is hardening the seals

There are a couple of Vic Forum members who have found the same thing, one in particular we flushed several times to try and reduce the smoke, is a KJ with under 200k on the clock

Personally I will only use Penrite, always have always will