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I use Amsoil Series 2000 80w-90 in my Eaton posi and its great. Runs much cooler and will last a very long time for you.
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Whats your average temperature, does it ever freeze there, how hard do you drive your car?

It's not really a big deal, but depending on your driving habbits it can be.

Theres nothing wrong with a good 85-90wt (not sta-lube) and this weight will work good if it does freeze. If it does not freeze and/or you drive pretty hard, I would then recommend a 140wt.

I myself run an ISO9000 350wt in my 12 Bolt, but it never sees temperatures below 55.
 

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I also use Amsoil 75W90 Series 2000. I use it in all of the posi rear ends that I build. If you want to use a petrolium oil then use a 80W90 with the GM additive #1052358 or Ford #M-19546. Either one will work fine.

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Discussion Starter #5
Thanks for the info. I used a Valvoline. 80-90, Do I still need the additive?
<BLOCKQUOTE>quote:</font><HR>Originally posted by big gear head:
I also use Amsoil 75W90 Series 2000. I use it in all of the posi rear ends that I build. If you want to use a petrolium oil then use a 80W90 with the GM additive #1052358 or Ford #M-19546. Either one will work fine.

<HR></BLOCKQUOTE>
 
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