Hi, I'm going to change the engine oil and not the filter on our 1973 +8. The oil and oil filter are both 1 year old, but has only been used for 3000 km. First question is if I need to change the oil after all as it looks perfectly fresh. Secondly, if I change the oil and not the filter, by just draining the sump and then immediately after fill up with fresh oil, will I lose the oil pressure and will the oil pump need to be primed? I plan to not start the engine immediately after the oil change as the car is located in a closed room for winter storage, but only after a a week or so. Do any of you have experience with Gulf 20w50 oil?
