Hi everyone, I just got a new vehicle to use delivering the paper and it's been 3000 miles since the last oil change so I'm debating whether to change it this week or continue to 4,000 miles. It's a 2003 Ford Focus with roughly 218,000 miles. I bought it from my mechanic and he tells me the previous owner always changed the oil between 3-4000 miles. The oil is Kendall synthetic blend from Goodyear here in town. My route is 80 miles every morning on mostly dirt roads which are pretty dusty this time of year plus any driving I do during the day. I consider this to be severe service so should I make sure to change it closer to 3000 or just go to 4? I'm probably being overly cautious because this car is still running extremely well despite the high mileage. No leaks or burning at all.