My Promax 300's have had the oil tank and injection setup blocked off to avoid the gear failure problems.. The previous owner told me he runs 50:1 but to me that seems kinda light on oil..

I sure dont want to run it to light on oil..

I know the oil debate has been beaten into the ground, but all the threads on it are now 4 or 5 years old.. What oil would you recommend?

I am no expert on those 300's, but 50:1 sounds fine, the new synthetic 2-stroke oils are far better than what we used to have.

Cale the SVT Allisons rippin around here on the river all runnin 50-1 mix

Ok cool! I'm just used to seeing 32:1 and higher! Thanks!

Merc reccomends running the 2.5L's at 40-1 with Merc High perf oil. I run Klotz R50 at 40-1 pre-mix never had a lubrication failure. But we are turing 9000rpm+ . I would feel a litte safer at 40-1.

Jeff

I have the promax 300s though, not 2.5's.

I run my 8000+rpm 2.5l at 32:1. I run my 6700rpm 4.0l Johnson V8's at 50:1.

There are some variables you need to consider. If the motors are EFI (I don't think Merc made the Pro Max in a carb model), stock except for the oil injection mods and you will not be running at WOT all the time then 50:1 will be fine.

If the rev limiters have been removed with an aftermarket chip and/or you like to run hard I would recommend 40:1 with a good synthetic like Klotz, Royal Purple, Amsoil etc.. the extra lubrication will help with engine life.

John

If you want the best run this....
http://www.amsoil.com/storefront/ato.aspx

Even at 100:1, its still 3-4 times stronger than any other 50:1 mix out there!

Anybody run Motul 800 2t synthetic ester? My old 2.4's seemed to like it and smelled good also.