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duke36 · 09-18-2020, 03:13 PM

Part of the discussion is the type of gear lube and if it's ok to use with certain types of metals like brass, bronze, etc. Some are not compatible with the modern additives.
The modern SAE 680 on the kinematic charts is close to 250 , not the original thick 600w as Kevin posted. These charts are on the net, etc. Many of the vendors' 600w is closer to SAE140 which maybe ok in the cold weather. What to thin it with is an interesting question.
The Meropa 1200 is thicker than SAE 250.

09-18-2020, 03:13 PM	#10
duke36 Senior Member Join Date: Jun 2015 Posts: 1,414	Re: 600w vs 90w Part of the discussion is the type of gear lube and if it's ok to use with certain types of metals like brass, bronze, etc. Some are not compatible with the modern additives. The modern SAE 680 on the kinematic charts is close to 250 , not the original thick 600w as Kevin posted. These charts are on the net, etc. Many of the vendors' 600w is closer to SAE140 which maybe ok in the cold weather. What to thin it with is an interesting question. The Meropa 1200 is thicker than SAE 250.