I use syn ONLY in my 2014 Chevy Cruze. Some kind of special additive for the turbo. "DEXOS" they call it. Everything else, (pickup, motorhome, motorcycle) get fossil. Never had an oil related problem and don't expect to. Regular changes is the simple and only answer.
Oh, and the (Generac) generator? 10-30 (fossil), Change the oil and filter once a year. No problems. Never had to add any, even with using the generator during "Sandy" for the 72 hours our house power went off.(That...was an extension cord nightmare..but it worked!)