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Differential Gear Oil

Posted by moore222

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Differential Gear Oil #1
moore222 Brett Moore Gilbert, AZ, USA	Posted: August 28, 2012 10:21AM Registered: 10 months ago Posts: 8

I have a 72 Mg Midget I wanted to change the differential oil on. After reading the forums it seems like maybe the consensus is to go with GL4 80w-90 oil. Just want to verify this is what I should get and find out what are some brands that are GL4 and where to buy. I'm having a hard time finding it online for sale.

Thanks,
Brett

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Re: Differential Gear Oil #2
mgat2420 Mike Gattone Wauconda, IL, USA 1974 MG Midget MkIII "Can 'o Worms"	Posted: August 28, 2012 09:44PM Registered: 10 months ago Posts: 33

I will be changing the diff oil in the near future and had planned on using Valvoline DuraBlend 80W-90 gear oil. It has GL-5, GL-4 and MT-1 API grade ratings, and also has the "extreme pressure" additives that are required for use in the diff. You can probably find it at most auto parts outlets; Advance Auto Parts sells it, the SKU is VV280.

-Mike

Edited 2 time(s). Last edit at 08/28/2012 09:55PM by mgat2420.

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Re: Differential Gear Oil #3
9146 rick dentel yardley, pa, USA 1970 Porsche 914 1978 MG MGB 2002 Mini Cooper	Posted: August 28, 2012 10:00PM Registered: 2 years ago Posts: 1,454

Mobil 1 75/90

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Re: Differential Gear Oil #4
oldag98 Jeff and Brittany Brackenridge Choctaw, Choctaw, Oklahoma, USA 1965 MG MGB "B" 1976 MG Midget 1500 "Yellow One" 1977 MG Midget 1500 "Dunkirk" 1979 MG Midget 1500 "Parts Car"	Posted: August 29, 2012 08:10AM Registered: 3 years ago Posts: 2,211

I tried to change mine last night. The drain plug just disintegrated when I tried to loosen it, like it was made from plastic. My guess is that it had never been removed before and had corroded/welded itself to the diff. Always something...

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Re: Differential Gear Oil #5
Astrostrat89 Jeffrey Jankosky london, USA 1971 MG Midget MkIII "Blue Meanie"	Posted: August 29, 2012 08:23AM Registered: 11 months ago Posts: 283

A quick search should pull it up, but there was some good info on GL4 vs GL5 on here, and that the past concerns with GL5 don't hold up anymore. They talked to the concerns of "yellow metals" copper and brass etc.

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Re: Differential Gear Oil #6
Kerr Norm Kerr Ann Arbor, Mi, USA 1974 MG Midget	Posted: August 29, 2012 11:32AM Registered: 4 years ago Posts: 2,515

yeah, when I first ran across the GL5 concerns I freaked out, but after reading up on it I learned that the issue was only with GL5 when it first came out, years ago. Anything you buy today labelled "GL5" is fine.

Norm

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Re: Differential Gear Oil #7
77Midget Y.. Lee western, USA 1977 MG Midget 1500 "Some Friend" 1996 Mercury Cougar "My Antique" 2002 Subaru Forester "Suba One" 2002 Subaru Forester "Suba Too" 2006 Honda Civic "Civic"	Posted: August 29, 2012 12:35PM Registered: 2 years ago Posts: 886

In reply to # 2156765 by oldag98 I tried to change mine last night. The drain plug just disintegrated when I tried to loosen it, like it was made from plastic. My guess is that it had never been removed before and had corroded/welded itself to the diff. Always something...

Silly Question Jeff,
Are you sure you took out the drain: at the bottom of the Differential and has an odd sized square drive or did you take out the PLASTIC confused smiley

breather?

Y.

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