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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Feb 2022
Posts: 61 Likes: 3
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2022
Posts: 61 Likes: 3 |
Hi, after we purchased our 1973 +8 RHD I changed the differential oil (and all other liquids). I'm using Mobil and Motul oils for our other cars, but after pouring Motul 90 PA Limited slip mineral oil into the differential, I've noticed a clicking sound when driving - both moving straight ahead and when cornering. Question is now if I'm using the wrong oil for the Salisbury differential? I've heard that Redline 75W/90 LSD synthetic is the oil to chose, but what is up and down in this? It's important not to break the differential as I understand spare parts are almost unobtainable nowadays. Cheers /Finn
Finn. 1973 Morgan +8. 1959 Austin Healey 3000 BN7 2-seater. 2009 Mazda MX-5 2.0 PRHT.
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Joined: Jul 2007
Posts: 27,846 Likes: 765
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,846 Likes: 765 |
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Feb 2016
Posts: 8,702 Likes: 416
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,702 Likes: 416 |
Hi, after we purchased our 1973 +8 RHD I changed the differential oil (and all other liquids). I'm using Mobil and Motul oils for our other cars, but after pouring Motul 90 PA Limited slip mineral oil into the differential, I've noticed a clicking sound when driving - both moving straight ahead and when cornering. Question is now if I'm using the wrong oil for the Salisbury differential? I've heard that Redline 75W/90 LSD synthetic is the oil to chose, but what is up and down in this? It's important not to break the differential as I understand spare parts are almost unobtainable nowadays. Cheers /Finn That's what I used in the BTR LSD on my Roadster. It cured the clicking I got when manouvering on full lock as it contains a friction modifier. Beware there is a similar packaged Redline product with an NS (no slip) suffix which doesn't have the modifier!
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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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 |
You can also buy a small bottle of friction modifier to fine tune the existing oil.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Feb 2016
Posts: 8,702 Likes: 416
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,702 Likes: 416 |
To that end Redline offer the friction modifier alone as on link below. ![[Linked Image]](https://i.ebayimg.com/images/g/bx4AAOSwG9Zbl~Tz/s-l300.jpg)
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Feb 2022
Posts: 61 Likes: 3
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2022
Posts: 61 Likes: 3 |
Thanks All, I just bought a bottle of Red Line LSD friction modifier. I'll change the rear axle oil and add a bit of this stuff when preparing the Mog for the Spring 23. Let's see (hear) if it works. Cheers /Finn
Finn. 1973 Morgan +8. 1959 Austin Healey 3000 BN7 2-seater. 2009 Mazda MX-5 2.0 PRHT.
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