In a couple weeks I plan on taking a 2500mi round trip roadtrip in the Jetta. Right now the current fill of Rotella T6 has about 3,000 miles (hard miles at that, and on a Napa Pro Select filter, didn't like the looks of it from the start, but was out of stock Mann filters from the dealer at the time) on it. Checked the level of it today and while it was correct the colour was mighty dark. Would you guys change it or let it go till I get back? I normally change it every 4K or 8mo, and I have plenty stock of filters and oil so I already have the supplies.