Optimal Diesel is the best diesel shop in town and does not just try to take people's money. Families have taken ranch diesel trucks and personal gas trucks to Optimal and found it professional and intuitive. The shop explains typical issues at certain mileage/age intervals, helps plan for big-ticket items, and keeps customers from being stranded on the highway. Knowledgeable people repair trucks faster than estimated and save money. The shop has a long waiting list, but the service is worth the wait.