Castrol Type C

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Type C would probably be close to a GL4 80w90 Marine. You should be good with Pennzoil Marine 80w90 GL5 gear lube. That should exceed that type C spec. Just be sure to use a Marine lubricant that resists water intrusion. I would advise against a synthetic.
 
Thanks. Online lube guides would suggest the same via application. But I've found everything from 80w GL4 to something more like ATF!
 
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