What oil is equivalent to Mobil SHC 636?

Answer 1

Mobil SHC 636 is a synthetic gear and bearing oil formulated with a combination of synthetic base fluids and a unique additive system. Its equivalent would be another synthetic gear and bearing oil with similar viscosity, additive package, and performance characteristics. It is important to consult with the equipment manufacturer or a lubricant specialist to ensure compatibility and optimal performance when selecting an alternative oil to Mobil SHC 636.

Answer 2

Mobil SHC 636 has just a couple of equivalents since it is a full synthetic gear lube with an ISO viscosity of 680 (about as thick as honey). They are Blue Sky Cirrus 680 and 76 SYNCON R&O Oil 680. However, both of those oils may not, and probably don't have the exact same additive package. The Mobil SHC 636 typically costs a little more than the other two alternatives but, if your warrantee is hinging on using the OEM specified oil, I wouldn't substitute it.

All of these oils are very high tech synthetics designed for small gear boxes (generally worm drives) under high loads and extreme temperature ranges. Non-synthetics are not a match and won't hold up. They are also tough to find in anything less than 5 gallon buckets, with the exception of the Mobil SHC 636 which is sold in small tubes on eBay and, I suppose, some other places.