Ok. I did an oil and spark plug change yesterday. It's a pretty hot day, but not that hot. Usually my water temp gauge runs between 160 and 180. after an hour of so of driving around. I looked down and it read 210! I never saw it that hot before. Maybe the oil is too thin? I bought 30 weight bcause they didn't have 40 and figured I'd see what 30 was like, but crap! Also, (now this is a rookie question) is the lower radiator hose supposed to be different inside than the upper one? My lower one seems to have lumps within it as if they were supposed to be there. Upper hose does not.