Originally Posted by dgeesaman

It isn't necessary. But you can do it if you want.

M104-AMG was making the point that if you're going to premix, MMO is not a good choice. And that if you have a working OMP system, MMO premixed in the fuel will reduce the effectiveness of the injected oil.

Baja, personally I think there is a tradeoff between mechanical wear and cleaner internals if you use MMO, vs a little more (maybe) gunk in the engine and less mechanical wear.

You can always clean off varnish and carbon. You can't put back metal.

Dave