gearbox oil

[daviddu79]

What box oil to put now. thank you

[jss06c6]

Assuming you are asking about the transmission.. if so, there are a number of brands out there to select from. The ZF transmission uses engine oil, not traditional "gear" oil. I'm running BMW M TwinPower Turbo 10W-60 in mine..

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[efnfast]

I run Amsoil full synthetic. Yes, it's light weight, 10-30 I think.

[Dynomite]

See LT5/ZR-1 Fluids (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp.html#post1580070550)

https://cimg7.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-353a8770_2463_4a3d_bd53_860920b2b618_1__215baaf45f a8310b57b69078bd80040f5003d62d.jpg

Amsoil SAE 10W-40 (https://www.amsoil.com/shop/by-product/motor-oil/gasoline/sae-10w-40-synthetic-premium-protection-motor-oil/) Engine
Castrol 10W-60 (http://www.turnermotorsport.com/p-1034-bmw-castrol-10w60-tws-synthetic-oil-e46-m3-e39-m5-e60-m5-e9x-m3.aspx) Transmission

[daviddu79]

See LT5/ZR-1 Fluids (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp.html#post1580070550)

https://cimg7.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-353a8770_2463_4a3d_bd53_860920b2b618_1__215baaf45f a8310b57b69078bd80040f5003d62d.jpg

Amsoil SAE 10W-40 (https://www.amsoil.com/shop/by-product/motor-oil/gasoline/sae-10w-40-synthetic-premium-protection-motor-oil/) Engine
Castrol 10W-60 (http://www.turnermotorsport.com/p-1034-bmw-castrol-10w60-tws-synthetic-oil-e46-m3-e39-m5-e60-m5-e9x-m3.aspx) Transmission

the problem, in France we do not find the oil CASTROL

[WVZR-1]

I don't see Amsoil distributors for France either but I'd think Amsoil easily sourced from the UK. I believe the Amsoil is the 'NOW GO TO' I wouldn't go out of my way for a Castrol product.

Check this link for information I think quite useful for your location. Maybe I overlooked France but I don't believe so.

https://www.amsoil.com/international/distributor/

[daviddu79]

Thank you, I'm going to look at the UK

[WVZR-1]

Thank you, I'm going to look at the UK

This I believe the product code you're looking for

MTFQT

Maybe on the International webs they also have a reference to the original GM # 1052931.

[Billy Mild]

Honestly Mobil 1 Gear oil is what I used, 75w-90. Never had an issue

[daviddu79]

I found on EBay
https://www.ebay.fr/itm/Original-Castrol-Motorol-SAE10W-60-1-Liter-NEU-OVP/231903247717?hash=item35fe82bd65:g:TnoAAOSw5VZXA5W f

[jss06c6]

the problem, in France we do not find the oil CASTROL
You should be able to find the BMW oil I indicated... Works very well in my '91.

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[Marc Haibeck]

Technically rear axle gear lubricant should not be used in the ZF S6-40. The synchronizer rings are a phosphor bronze alloy. The EP additive in hypoid gear oil attacks the phosphor bronze material. This is why GM used a Texaco motor oil with some additives deleted for the GM transmission lubricant. The ZF service publication specifies that Castrol motor oil can be used.

I have never heard of a problem from running gear lubricant in the 6S-40. However, since specialized manual transmission lubricants are available from Amsoil and Red Line, it's best to use these high quality products.

[lfalzarano]

What weights of the Amsoil and Red Line do you recommend for our transmissions?


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[Marc Haibeck]

The Amsoil MTFQT product is 5W-30 just like the GM lubricant was.

Red Line recommends 10W-30 motor oil SKU 11304. I believe that 10W-30 viscosity is good for 20 degrees ambient and up.