I bought some today to try and it looks very light. I have always used the merc green stuff, but decided to look into Mobile since that is what I use for the engine and the oil filters.

I have been using Ams Oil , It has been working fine, It pours like water and have had a ginnie pig for five years. His drives have never been apart and he runs like h----l. My wife sell's it she can fix you up.

I'd like to try it myself. The tech guy in Powerboat magazine says this is definitely the way to go but I have reservations about mixing it with the residual amount of Mercrusier HP stuff that will remain in the drive after draining. The Mercrusier HP bottle warns not to mix the HP lube with their regular gear lube for some reason.

Mobil-1 works great and after a hard run and then pulling the plug will get most of the other stuff out. Next time around I am going with Redline. I like the idea of lots of moly to cushion though Mobil makes a great product. It exceeds GL-3 ratings. Don't use a GL-2 lube. I have seen guys fill with engine oil flush.....turn the props a few times and let it sit 15 minutes and drain and then refill. I never did that but hear it cleans the inside components out.

Mobil 1 75/90 is a GL-5 oil. A friend of mine is using it in his Bravo behind a whippled 502 with no problems so far. I use it in my DPX, but that is what Volvo uses as their synthetic drive oil, which they list as a high-performance oil.