Extreme Pressure Gear Oil?

[TuffWork]

Here's the deal. My Walker manual suggests an Extreme Pressure 80w-90 gear lube for the PTO Gearbox. I originally bought Lucas Heavy Duty 80w-90, but realized it says nothing about being "Extreme Pressure". I read a little more and saw that this would work in the gear axles so I kept the bottle and went back to the autoparts store in search of something "e.p.". The only one I could find is vavloline Durablend 80w-90. This is a synthetic and is a limited slip formula. It says it is extreme pressure in the description on the back. Is this what I'm looking for? Will both work? or neither?

[SouthSide Cutter]

Any 75-90 good sny. gear lube will work. Mobil 1, Royal Purple and Amsoil. Used to roll the teeth in my drag rear ends until I started using one of the three. Never done it again. And that is all I use in lower gear case on outboards, my dually rear end and all other gear boxes.

[LupineLandscaping]

Napa 85-90 here (deck gearboxes, pto gearbox, and axles). Never had any problems. We rebuild the deck gearboxes every 2-3 years regardless. It's just cheaper in the long run to replace seals and bearings than cases and cogs.