Im going to change the oil in my mower. I got 6 large accounts in 3 days. Should I put mobil 1 syn 10-30 in my 2003 48 15 HP kawa motor?? Mower runs for about an hour to two hours straight each lawn in the hot heat. In 95+ heat should I use syn?? I vouch for mobil 1 one used it in my bikes, sports car and my truck. I need a bigger mower LOL. You guys were right that I was gonna out grow my mower and trailer 3 months ago. Have 16 accounts in one year!! Just that I know oil breaks down at certain temps and since im getting more accounts and the temps are rising should I be worried. Most of my lawn are on the same straight route so the equipment doesn't cool down.