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Which Diff Oil?


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#1 agent_zed

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Posted 19 September 2017 - 06:14 PM

Hi,

 

so book says i need SAE90 hypoid gear oil for my diff. Eurocarparts does an EP90 http://www.eurocarpa...776132&&cc5_868which does specify ' best used for hypoid differential ' and a GL5 rating.

 

Is this what i need? is it just a newer spec that exceed SAE90?

 

any advice appreciated

 

:)



#2 cb750

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Posted 19 September 2017 - 07:21 PM

I use Comma oils. This is the reply they sent me when I asked what should be used in my Sierra diff if that's any help:

"We can recommend for the differential in your Ford Sierra our EP80W-90 GL-5 gear oil"

#3 lotusPaul

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Posted 19 September 2017 - 08:43 PM

I agree with th Comma oil. Sold in Halfords @ £9.99 per ltr. Even cheaper with the trade card.

#4 agent_zed

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Posted 19 September 2017 - 08:51 PM

ah ok cool. That's really helpful. Will put that on the shopping list.

 

I just read on wiki ...

 

EP additives which contain phosphorus/sulfur compounds are corrosive to yellow metals such as the copper and/or brass used in bushings and synchronizers; the GL-1 class of gear oils does not contain any EP additives and thus finds use in applications which contain parts made of yellow metals.

 

Which i assume is why you can't use EP in the gearbox but you can use it in the diff, as i am assuming the diff doesn't contain any copper/brass parts.

 

thanks



#5 Grim

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Posted 20 September 2017 - 07:41 AM

EP4 for the gearbox, EP5 for the diff