I'm at my first oil change and as per the manual, I need an oil change. According to the temp chart I should probably be using SAE30. My question is should I use a synthetic oil or a regular oil. I've always heard you should break an engine in before switching. I'm assuming since the manufacturer wants you to change the oil, it must be broken in, right? Also, it doesn't say to change the oil filter. Is that right or should I change it if I go to synthetic? Yes, this is my first commercial mower, so be nice. I like to check with the pros before doing something that will harm my equipment. So is it a good idea to go synthetic now or not? Thanks in advance.