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I use Redline MT90 in my TR6 and TR250. The TR8 Rover 5 speed gets Pennzoil synchromesh. I think the a majority of TR2-TR6 owners are using MT 90.
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<blockquote type="cite">On Aug 6, 2023, at 7:07 PM, Jay Galbreath via Wpta <wpta@autox.team.net> wrote:<br>
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<div dir="auto">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</div>
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<div dir="ltr" class="gmail_attr">On Sun, Aug 6, 2023 at 10:53 AM JIM UNDERWOOD via Wpta <<a href="mailto:wpta@autox.team.net">wpta@autox.team.net</a>> wrote:<br>
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<span style="font-family:helvetica;font-size:12pt">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. </span></div>
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<span style="font-family:helvetica;font-size:12pt">Jim</span> </div>
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<div>On 08/06/2023 8:50 AM EDT EDWARD WOODS via Wpta <<a href="mailto:wpta@autox.team.net" target="_blank">wpta@autox.team.net</a>> wrote:
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For all of you still using engine oil in your Triumph or MG gearboxes: </div>
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And, by the way, when’s the last time it’s been changed? “Dirt is the enemy of all machinery”
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Ed Woods </div>
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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. <br>
Ralph Steinberg </div>
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