I only check my pressure gage. However, I have a question regarding oil. I use Quaker State Sunquest 20-50 (synthetic) and I change my oil two times a year. I do about 20,000 KM a year. ...Leaving in Canada it has served me well both in Winter and Summer; however at times I wonder whether leaving the same oil in there for 6 months at a time is too long? Any thoughts on that? 89 200 TBQ