Hey all. I just found this forum. I have 4 vehicles. I wanted to know the time limit for oil. It’s been 5 months since the last oil change on my ’83 Jeep CJ. It has less than 400 miles on that change. My ’04 Dodge truck is at the 3 month interval. It has less than 500 miles on it. The other two are at their 3 month intervals with less than 1000 miles on them. Do I need to stick to the 3 month limit on oil? I know the CJ is over the 3 month limit, but do I need to change oil as often as I do with such low mileage? I use Pennzoil 10W-30 or 5W-30, depending on what the vehicle calls for. My 2 tractors call for oil changes at 200 hours, but I change it once a year. Even though one tractor only gets about 100 hours and the other sees less than 50 hours. But that is a diesel service type oil. Am I changing too often?