Multi-viscosity oil in transmission

[vern hodgson]

Is 95/140 oil ok to use in transmission?

[glenn in camino]

I'd stick with just the 140. The so called 600W is really 140W.

[WestCoast]

yes for summer, but 85-90 is best in winter, the heaver gear oil in cold weather makes he trans stiffer and harder to change gears

[harleytoprock]

Try it. If you don't like it, you can always drain and fill with something else. I dislike that with 600wt it will shift different between cold and warmed up.

[Mike V. Florida]

Originally Posted by glenn in camino

I'd stick with just the 140. The so called 600W is really 140W.

The 600W is a brand name not a viscosity. Yes it is confusing.

[captndan]

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90W and half a can of Lucas.

[George Miller]

Originally Posted by vern hodgson

Is 95/140 oil ok to use in transmission?

Yes works real well.

[Kevin in NJ]

Originally Posted by glenn in camino

I'd stick with just the 140. The so called 600W is really 140W.

No it is not the same oil.

Here is what was researched out in the past:



Posted by Marco Tahtaras from c-24-4-43-195.hsd1.ca.comcast.net (24.4.43.195) on Saturday, August 09, 2008 at 9:38AM :

In Reply to: Mobile 636 gear oil posted by Bob from ? (64.237.121.113) on Friday, August 08, 2008 at 10:35PM :

Mobil:
Mobilgear 636 (Which has been replaced with MOBILGEAR 600xp 680 11/27/2011)

BP:
Energol GR-XP 680

Castrol:
Castrol Alpha LS680

Shell:
Omala 680

Texaco:
Meropa 680


Here is some more info
Re: 600W Thickness -- One (1) Answer


Read Follow Ups Post Follow Up Model-A Ford Message Board FAQ
Posted by H. L. Chauvin on Nov. 26, 2011 at 16:34:03

In Reply to: Re: 600W Thickness, Transmission Gear Grinding
posted by louis on Nov. 25, 2011 at 17:19:35

Hi Louis,
Your former question made sense when someone new to this Forum reads "all" of the many "different" former 600W discussions in the attached archives.

It appears most "salespersons", (parts suppliers & oil compaies), offer the 1930's 600W substitute, but as Marco noted in the archives in the late 1990's, they are "not" all the same.

Many articles appear on experiences of switching to thicker transmission oil; thus eliminating driver's not experiencing grinding of transmission gears.

Gear oil thickness, (resistance to flow), is measured by several methods.

Kinematic Viscosity per ASTM D445 is one standard method indicating the milimeters squared divided by time in seconds at 40 degrees C, or 104 degrees F, which is closest to trasmission gear oil viscosity after attaining operating temperature.

For example, per ASTM 445, water has low viscosity, honey has high viscosity.

The recommended BP Energol 680, Shell Omala 680, Mobile Extra Helca Super Cylider Oil 680, have ASTM 445 measured viscosities, (40 C), of a high 680; Texaco Mepora 680 indicates a thinner 646; however, Valvoline 85/140W drops down to 395, & Castrol 85/140W is thiner at 369.

One of the "most" scientific test conducted on Ford's 1930 recommended 600W appears to be a gentleman who wrote that he had an old sealed can of
Ford's recommended 600W.

After trying many gear oil substitutes, his highly scientific lab test indicated that the 600W was extremely thick, almost like melted tar, & equal to the above mentioned 680 viscosities.

His test, he dipped his finger in each & watched it flow!

It appears if one uses recommended gear oil with a viscosity of 680, & gears continue to grind, begin looking somewhere else.

Hope this helps 1930's future 600W research.

[RonC]

600w oil is probably closer to sae 240w. I find shifting is better in warm weather with the original weight oil.

[fritznbud]

Not to mention, today's gear oil, the #5 that most lubes cover, will eat up brass in the trans. My Ural sidecar bike has straight cut gears, like the model A, and that is where I read about the #5 type.

[RonC]

Shell Omala S2 G 680 is one of the Ford 600w equivalents

[Houdini]

So using the Shell in the example above, who carries this stuff. Also should we use this in our steering gear box and the rear end, since 600w is recommended for those also.

[Tom Wesenberg]

I found the heavy gear oil at my local Mobil bulk oil dealer listed in the yellow pages.

Yes, use it in all 3 places.

[Patrick L.]

Originally Posted by vern hodgson

Is 95/140 oil ok to use in transmission?

I think it will certainly work better than some of the concoctions folks come up with, which I can't/won't recommend.

Straight 140 will work fine in cooler weather. We used it for years in all weather before we knew any better.

Straight 250 will work fine in warm weather. If it can't be found locally, Lubriplate will have it.

600W is actually in the 200-250 range.

[Chris Haynes]

If you have ever cracked open a trans or rear end that still had the original Ford Fudge in it you would immediately recoil from the pungent odor. That odor was from the whale oil that was part of the original Ford formula.

[SeaSlugs]

Originally Posted by Chris Haynes

If you have ever cracked open a trans or rear end that still had the original Ford Fudge in it you would immediately recoil from the pungent odor. That odor was from the whale oil that was part of the original Ford formula.

smell always reminded me of purple childrens cough medicine...yea that "ford fudge" is exactly that - gets on your skin and you stink like it for a few days, doesnt wash off with anything either... WD-40 ive found works the best but then you smell like WD-40 haha..