My 292 has 530 hrs on a pair of 350 mags and use nothing but VR1 40W.
I had a relief spring in the oil pump crap out on starboard engine this year at 510hrs and while motor was out I took a look at the lower end and everything looked fantasic.
Cyl walls, rod and crank bearings all looked great. Just through a new set of rod and main bearings in since we were there anyway and put her back in and runs like a champ again.
I also change the oil every 30 hrs to so that might have something to do with it also.