z335e

Hi all! New to the forum. Just purchased my first John Deere and would like some advice. I've had terrible luck with transmissions on my past two mowers (1 Troy-Bilt, 1 Husqvarna). I now have a zero turn z335e. Is there anything I should do from the start to prolong the life of my mower? I found out after the fact that I should have put a heavier weight oil in the tranny of my Husqvarna. By the time I researched the slipping transmission problem, it was too late. Any advice would be greatly appreciated! Thanks...

z335e