Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Mar 2018
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OP
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Does anybody have any detailed information on topping up/changing the gear box oil on a M3W?
I did try searching the Forum but I'm new to this and couldn't find anything but I can't be the first to ask this!
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Joined: Jul 2013
Posts: 1,338
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2013
Posts: 1,338 |
Have a look at my “very excited” Thread.
It’s close to midway if I’m not mistaken.
I hope it helps.
Last edited by Q8morgan; 03/10/19 03:28 PM.
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Joined: May 2011
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Joined: May 2011
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Does anybody have any detailed information on topping up/changing the gear box oil on a M3W?
I did try searching the Forum but I'm new to this and couldn't find anything but I can't be the first to ask this! Remove the boot liner. Jack up the rear of the car and support. Remove the drain plug in the rear face of the bevel box 24mm socket required with a short extension, if you have the NVH kit access is tight Lower car and allow oil to drain not much comes out only about 300ml Raise car again and refit drain plug undo filler, which is about 50mm directly above the drain plug on the rear face and requires an allen(hex) key to undo, 10mm if I remember. Using a syringe and plastic tube fill the bevel box from above where you have removed the boot liner until oil comes out of the fill hole and refit fill plug. Lower car Refit boot liner You will find threads on here recommending filling through the orange breather on the RH side of the bevel box, this is not recommended as it can lead to leaking seals. There are lots of threads on the subject, try using google and something like "talk morgan bevel box oil change"
Last edited by Rog G; 03/10/19 03:41 PM.
2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
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Joined: Feb 2019
Posts: 3,857 Likes: 2
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
Does anybody have any detailed information on topping up/changing the gear box oil on a M3W?
I did try searching the Forum but I'm new to this and couldn't find anything but I can't be the first to ask this! Remove the boot liner. Jack up the rear of the car and support. Remove the drain plug in the rear face of the bevel box 24mm socket required with a short extension, if you have the NVH kit access is tight Lower car and allow oil to drain not much comes out only about 300ml Raise car again and refit drain plug undo filler, which is about 50mm directly above the drain plug on the rear face and requires an allen(hex) key to undo, 10mm if I remember. Using a syringe and plastic tube fill the bevel box from above where you have removed the boot liner until oil comes out of the fill hole and refit fill plug. Lower car Refit boot liner You will find threads on here recommending filling through the orange breather on the RH side of the bevel box, this is not recommended as it can lead to leaking seals. There are lots of threads on the subject, try using google and something like "talk morgan bevel box oil change" I believe the OP was talking about the transmission Gear Box) rather than the rear end (bevel box). Maybe I am incorrect and if the OP would clarify he might get what he needs. I know the transmission access is not as easy as the bevel box.
Last edited by LightSpeed; 03/10/19 03:55 PM.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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I would think an online search of Mazda Miata 5 speed gearbox oil change might yield useful results.
Steve
Late 2012 M3W
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Phil Bleazey recently reported that he has had good results with 'bog standard 75/85 mineral oil as recommended by MX5ers'.
Andy
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I believe the OP was talking about the transmission Gear Box) rather than the rear end (bevel box). Maybe I am incorrect and if the OP would clarify he might get what he needs. I know the transmission access is not as easy as the bevel box.
I must learn to read, the OP post does indeed say gearbox
2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
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well, the bevel is a gear..... 
Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys
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well, the bevel is a gear..... True, and it is indeed in a box. What do the Brits call a transmission? We Americans generally refer to a gearbox as a TRANSMISSION, at least on the Westcoast where I had all my automotive experience.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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That'l be the gearbox, the bit in the middle.
The bit at the back can be known as: back axle, final drive or Diff. Depending on who you are talking to.
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