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Wales
by Joske Vermeule, September 1
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Forums39
Topics49,911
Posts838,146
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Most Online1,063
Jun 14th, 2026
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Joined: Dec 2008
Posts: 22,371 Likes: 354
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,371 Likes: 354 |
The 75w90 grade is what I would expect to use in an MGB diff.
For the BTR I use Morris Lubricants, from memory either 75W140 or 80W140.
I don't think the fully synthetic/Semi synthetic difference matters, but it's handy to have it include friction modifier, although this can be bought and added separately.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Dec 2008
Posts: 22,371 Likes: 354
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,371 Likes: 354 |
Just checked, and 75w90 is the gearbox recommended grade for the more recent Plus 4.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jun 2019
Posts: 1,236 Likes: 40
Has a lot to Say!
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Has a lot to Say!
Joined: Jun 2019
Posts: 1,236 Likes: 40 |
Miller oils website has a handy guide to which lubricant you need, it even lists Morgan. From memory I think the back end oil was 75w 140NT+
No connection, just a happy customer.
Gordon Duguid
2014 Duratec engine plus 4, Montreal blue.
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Joined: Dec 2009
Posts: 37,486 Likes: 993
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,486 Likes: 993 |
https://www.mpdonline.co.uk/product...-ls-gear-oil-gl5-1lt-ls80w901l/LS80W901LI use this product for my LSD BTR it’s the one the local boys use in their Scoobies. Used it for 17 years now. I use Comma lube products for every application on the Plus 8, they are good quality products at Devon (sensible) prices you can overthink lubricants.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Nov 2015
Posts: 8,703 Likes: 501
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,703 Likes: 501 |
Miller oils website has a handy guide to which lubricant you need, it even lists Morgan. From memory I think the back end oil was 75w 140NT+
No connection, just a happy customer. NT is the posh nano tech stuff, went to a talk at Millers a few years ago & NT grades are clever stuff
Jon M
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Joined: Jun 2015
Posts: 2,095 Likes: 75
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2015
Posts: 2,095 Likes: 75 |
Thanks for all the contributions on this. Gordon’s & Dave’s memories correlate with Millers who along with Morgan, recommend 75w140.
To my mind, it seemed a bit heavy for a light vehicle. However, Rich is quite happy with the lighter version but as he said...you can overthink these things. Also amazing the price difference between Comma and Morris! (£8 odd vs. £20 odd)
I believe it is more important to ensure that proper LSD oil (or additives) are used in a LSD diff. to cope with shock loadings, more so than the actual viscosity.
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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Joined: Dec 2009
Posts: 37,486 Likes: 993
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,486 Likes: 993 |
To my mind, it seemed a bit heavy for a light vehicle. However, Rich is quite happy with the lighter version but as he said...you can overthink these things. Also amazing the price difference between Comma and Morris! (£8 odd vs. £20 odd)
I believe it is more important to ensure that proper LSD oil (or additives) are used in a LSD diff. to cope with shock loadings, more so than the actual viscosity. That is my thinking Deejay that on a lightweight car the standard diff grade is more than adequate but has to be LSD capable.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Jul 2020
Posts: 59 Likes: 1
Just Getting Started
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OP
Just Getting Started
Joined: Jul 2020
Posts: 59 Likes: 1 |
I checked the gomog +8 specific and it states SAF-XJ 1.7 ltrs . this then became syntrax 75w-140 . Now according to opioil website this has been replaced by transmax 75w-140 all castrol oil but I couldn’t find any more info regarding this change I supposed because it’s a long life oil and not something you change regular it doesn’t crop up that often
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Joined: Jul 2020
Posts: 59 Likes: 1
Just Getting Started
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OP
Just Getting Started
Joined: Jul 2020
Posts: 59 Likes: 1 |
Forgot to say mines a 97 so BTR axle Salisbury may be different
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