I agree about the Rotella 5w40. Used it before and my scoot was happy.- Yamaha Roadstar. Currently using M1 15W50.. I'll switch over next change, been thinking bout that one.
I'm using M1 5W30 in my JD130 just because I use it in my 03 Cavalier, 6.5 hp B&S Toro mower & 3.5hp B&S edger. Want to just buy 1 oil and be done with it. I buy the 5qt jugs which is much more cost effective. I think Meijers has better prices now then Wally's. I did notice a diff in cold weather starting using 5w30 in the Toro -vs- st 30 wt., it actually starts when cold ! BTW, JD has a special B&S engine built for their tractors. A really sweet 22hp Vtwin engine; pressurized oil system. The M1 filter(13-15 pd valve) is twice the size of the JD, which I only bought because it was free with oil at Meijers sale.
If anyone thinks I screwed up with the M1 5w30 for the tractor, please lemme know. I did put a couple hours on it and all seems fine, runs smoother and I think the RPMS' are actually higher. lol
I'm hooked on M1 oil and Purolate Pure One filters. I believe their the best you can buy.