Melancholy Bear
Member
I only put on about 50-hours per year. At my 50-hour service a couple years ago, the mechanic told me assuredly that I don't have to change the oil until I reach my 300-hour service. Now I'm questioning that. Does oil go bad or break down or lose efficacy after a year? Should I be changing oil every year no matter how many hours I put on it? And if so, does that go for the other oils like transmission and hydraulic, or just the engine oil?