I’ve been running both the Max aluminium and Hasi aluminium for some time now.

Both engines break in easier.

Both run cooler (5-10deg).

Both so far have held up extremely well. Most of the damage with any engine is done during the break in stage, so that’s the big benefit I think with these new style engines.

The bad wrap aluminium engines get was from the Sirio days 15-20 years ago, they were fast but didn’t last. Technology has come a long way since then.