The general consensus with any motor vehicle is 2 years for coolant and brake fluid. When I bought my '07 Silverado 1500 new, I did the brake fluid at year 12, and coolant at year 10. My '05 Sportsman 800 went all of 10 years on the OE coolant. I don't get paid to maintain my own equipment, so I slack pretty bad, lol. Now that I think of it, the brake fluid in my restored '74 RD350 is also 10 years old right now, going on 11 next summer.
As far as grease fittings, or zerks, go, they haven't used them for years. My '05 800 didn't have any, except on the front yoke of the rear driveshaft. All the suspension bushings started to squawk and get real noisy after 8-10 years. I just disassembled everything and loaded them all up with Amsoil waterproof grease, and never had an issue again. Made the machine ride 100x smoother, too.
Sold her in '19 and bought a paramotor