[WPTA] Gearbox oils, for your Sunday reading pleasure

[Clayton Yonker]

After the issues I was having with a j type transmission I’ll never use
anything other than MT-90(thanks Jay) I had previously used straight 30
weight non detergent oil and 20/50 pennsgrade and had issues. It cleared up
the overdrive issue and haven’t had any problems since.

On Sun, Aug 6, 2023 at 6:59 PM Jay Galbreath via Wpta <wpta at autox.team.net>
wrote:

> In the early 80’s BL Factory recommended that all Triumph (Rover) 5 speed
> trannys have ATF. I still recommend 30 weight non-detergent  oil for a B
> tranny. . Jay
>
> On Sun, Aug 6, 2023 at 10:53 AM JIM UNDERWOOD via Wpta <
> wpta at autox.team.net> wrote:
>
>> I found that in my MGB, the OD would slip on a high RPM shift with gear
>> oil.  Switched to ATF and the issue was gone.  I don't know how many times
>> I had the engine in and out thinking it was the clutch hanging up.  Ran
>> into the same issue on a friends 79B with OD.  The TR8 gets GM syncromesh
>> fluid which is a light viscosity.  ATF works as well and many use that.
>> Put Gear oil in a Rover 5spd and you will be grinding gears until it gets
>> hot.
>> Jim
>>
>> On 08/06/2023 8:50 AM EDT EDWARD WOODS via Wpta <wpta at autox.team.net>
>> wrote:
>>
>>
>> For all of you still using engine oil in your Triumph or MG gearboxes:
>> And, by the way, when’s the last time it’s been changed? “Dirt is the
>> enemy of all machinery”
>>
>> Ed Woods
>>
>>
>> People confuse engine oil weights with gear oil weights. They have >
>> nothing to do with each other. A 75w gear oil has about the same viscosity
>> > {pourability} as 20w engine oil. Back in the days when your cars were new
>> oil technology expecially gear oil was rather crude. 30w engine oil was
>> used because they did not have a gear oil that was thin enough. Light
>> weight gear oils are fairly new. The last 15 years or so. Gear oils are
>> designed for shear stregnth. Meaning they cling to virtical surfaces.
>> Engine oil does not. By using straight weight engine oils you are using
>> ancient technology. It would be the same as putting on rayon/nylon tires,
>> using poor fuel etc. We use 75w/80 gear oil in all but our racing boxes.
>> These use a 75w synthetic oil. One of the boxes, a pre-war jag box had over
>> 30,000 miles of rallies on it before it broke a gear tooth. There was no
>> evidence of abnormal brass wear on the syncros. I have never had an oil
>> engineer in 25+ years of business tell me that hypoid oil attacks brass.
>> The light weight gear oils shift better and protect your gears better than
>> any engine oil.
>> Ralph Steinberg
>>
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