I think you're talking about the zerk fitting on the PTO which lubes the drive shaft, I use waterproof marine grease (Walmart). For the pump oil I use Mobil 1, 75W90, synthetic GL1 gear lube. BRP does market products for both of these areas, but it's a lot more expensive.
I use waterproof marine trailer bearing grease for the PTO drive shaft splines, and mercury high performance gear oil for the jet pump bearing hub. If I was heading to the autoparts store I think any 90wt gear oil should be fine but I have 2 barrels of merc HP gear lube so that's easy to draw from.
Klotz synthetic pump oil(75W90) and Lucas oil grease(red). You're going to get a thousand different opinions on oil and grease. Any quality oil and grease will do.
Klotz sure does smell great. It's a good oil too. A lot of my friends use it in their sleds and it doesn't booger up the RAVE's in sleds. I still stick with XPSII in my ski and sled though. Easier to just use one oil.
Not sure why nobody uses what the manufacturer suggests? That's far and away the best products imo and they aren't even very expensive. The pto should use the seadoo synthetic grease which is an excellent sticky grease that doesn't dry out like other greases. The pump oil should be the synthetic seadoo pump oil which is also an excellent oil. I'm sure other products will work but I've used these for lots of years on more machines than I can count and have basically had zero issues. People should give BRP some credit, they typically are pretty smart people.