I like your answer, and all others thus far. It must be mentioned that I felt nervous about the idea of going 30000 without a change, but I liked the idea of not having this task be so frequent (after all, I have five cars now, and have been doing oil changes for 35 years… it gets a bit old). I pride myself on helping engines last long, and I feel there is a vehicle’s soul that sighs relief every oil change. I did not mention that all vehicles are out of warranty, but this is one primary factor in going longer between changes. I think I will do this one synthetic change this time and then go back to regular oil at regular intervals just because I am old hat. And what is synthetic oil anyway? I would assume it is something out of a lab instead of out of the ground. I wonder if when oil is really expensive will it catch up with the price of synthetic? and is this black graphite stuff still out there?
Thanks much for your comments