What lube were you using before the switch to Amsoil? Did you change the drives when you started using Amsoil? Wondering if it is worth switching. I have twin Yanmar Diesels with X diesel drives. I (BAM Marine) rebuilt them at almost 1000 hours because I had pitting in the upper gears. I almost never leave the water but do run hard occasionally and often do runs to Bahamas with a lot of weight on the boat.

You got a 1000hrs???? I think I'd stick with whatever the heck you were doing!

lol the engines are only 315 hp, well about 375 now after some fiddling, but still low compared to most on here. The do have a lot of torque and the way diesels make power is supposed to be hard on drives. But since I don’t like throwing money away I try to be easy on them when I can.

the have mostly had only Mercury HP gear lube. But maybe you have a point. If it ain’t broke.

If anyone's interested I'll sell mine.
Mike rebuilt them for me and I believe there set for 725hp. Still in the boxes.
Both for $3000 plus shipping

Are you going back to standard couplers?

I had one clutch set to low and when it burnt up I switched back until they were repaired but never got around to putting them back in. Since going to scx uppers haven't had any issues.