Mercury Quicksilver High Performance Gear Lube is SAE90 gear oil made for the lower unit of marine engines. It is available at any Walmart. You can find it with the marine supplies. It will not be in the automotive oil section. I use it in my SM420 tranny and my Eaton H)52 rear end.

Don't confuse this with its sister item--Mercury Quicksilver Premium Gear Lube which is SAE80W/90.

As stated in previous posts, SAE90 gear oil is definitley hard to find. It is extremely hard to find in quarts, easier if you want a five gallon pail or a 55 gallon drum. The Mercury Quicksilver SAE90 is sold in individual quarts at Walmart. Not cheap...about $12 per quart.

Maybellene