I service my cousins Yamaha 60 hp 4 stroke, and we were both saying that Yamalube 10W30 seems expensive, at $10 a quart. Do they have any FC-W rated 10W30 and 10W40 oils out there a little bit cheaper? $10 a quart for non synthetic is a tad bit expensive. The motor is 10 years old with only 98 hrs, but I'd still like to use the proper oil, my cousin knows nothing about engines, so he expects and trusts me to use the right stuff.