600w

My simple answer is “no”.

True 600w oil is designed to be used on steam cylinders and is very thick.

90w oil is designed to be used in modern motorcycle transmissions and rear ends.

If you can’t find 600w oil, some Model A owners use STP in their transmissions and rear ends.

Lighter oil will cause leaking and shifting problems. Enjoy.
 
Seems like the stuff sold today all claims to be thicker than 80w-90. Brattons says SAE 140, Macs says SAE 250.

I got some from Macs a while ago and it is thicker than regular gear lube although it smells and looks exactly the same.

I also have an old bottle that is even thicker, very dark and without the typical gear lube smell. Not sure where it came from but it looks like the picture on Brattons website.
 
600W is different than 80-90.

600W is about 180-240 weight. 140 or 250 work just fine. 90 is a bit light.
 
Is there more than one STP. I bought a bottle and when I got home it was rather thin. The old stuff was like Honey, some even called it Honey. Jack
 
jhowes said:
Is there more than one STP. I bought a bottle and when I got home it was rather thin. The old stuff was like Honey, some even called it Honey. Jack
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Which one did you buy ? There are different types. I think the fellas here use the old original additive which is like honey.
 
bobsmanstuff said:
Is 600w gear box oil any different then modern 80-90 w?
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YES, there is.

Just a little education,

600W is not a designation of a weight of oil. It is the name of an oil sold by Mobil Oil and has it's roots back to the beginning of industrial revolution.

"Mobil Cylinder oils are high performance high viscosity oils designed for use in enclosed worm gears operating at moderate to high speeds and temperatures, and where heavy loads, slow speeds or high temperatures demand high viscosity oils. They are also intended for use in steam engine cylinder applications. They are formulated from high quality base stocks that are resistant to oxidation and thermal degradation, and the build-up of harmful deposits caused by the high operating temperatures of steam cylinders. They protect against rust and corrosion and provide good film strength and excellent lubricity and they are resistant to water washout."

Now, is there a difference between the generic "600W" sold by the vendors and gear oil, NO.

There are a bunch of "formulas" used by owners and all have been successful.
 
This graphic may also help you decide what to do, what to use. The viscosities quoted in the Product Data Sheet above are on the left, SAE Gear Oil numbers on the right.

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Do a forum search on "600w" and you'll probably get more info than you want.

It should be noted that in the transmission the oils viscosity along with technique are what synchronize the gears for grind free shifting. As the viscosity of the oil goes down the technique must go up and at some point no amount of technique will prevent gear grinding during shifts.

Here's what I use.

http://asm-mexico.com.mx/sitio/administrador/descargables/archivos/i16_20140912104421.pdf

It's extremely viscous and unlike STP it's not just an additive but actual gear oil.
 

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