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1994.5 - 1997 7.3L Power Stroke Diesel  

Castrol Syntec 75w90 in the diff?

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Old 03-29-2008, 01:47 PM
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Castrol Syntec 75w90 in the diff?
The manual says 80w90 for the diff lube but I'd like to switch to synthetic. The only syn lube in town is Castrol Syntec 75w90 - am I ok with that?
They had regular Castrol 80w90 but it was only rated for passenger cars and light trucks.
 
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Old 03-29-2008, 01:51 PM
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yeah i think thats the weight i put in my truck, just quaker state brand.
 
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Old 03-29-2008, 02:43 PM
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you will be fine with that. I run 75W140 Royal Purple
 
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Old 03-29-2008, 04:36 PM
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Done deal, thanks guys.
 
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