The Silverado is going to the mountains again here in another month or so, and like every year im torn on the oil change, I changed it about this time last year and im currently just under 5,000 miles. 1,500 TO 1,800 of those miles were put on last fall for this same trip, mostly highway however much up the trip is chugging up and down the foothills and through the mountain areas, Frankly it starts getting Hilly as soon as you cross over into Kentucky.. the othe 3,000 miles have been winter, 4x4, pulling a light trailer with ATV'S etc.. so not exactly gravy miles, maybe not extreme but harder than unloaded summer driving. My intent was to dump the Mobil 1 SYN out of it in another couple of weeks and start over, i know the oils not done however its been a year and its getting ready to go back to the mountains again (1,500 1,800) round trip.. if i wait its going to have right at 7,000 on the clock however most of that is 70-80mph in the hills The BITOG in me says "HECK WITH IT" run it up to 7,000 My conservative side says "C-mon youv used it a year" Dump it.. Run it and dump it ? or dump it and start my year over (and my vacation) with fresh in the sump ?? Im not worried, im just voicing my thoughts.. what say you ?