from merriam-webster.com (www.m-w.com)

3 a : scrupulously and conscientiously faithful b : FERVENT, ZEALOUS


i'd say that is an applicable term in relation to vehicle maintenance.

02 Mustang GT... Tuned by Nelsons. Low 12's, anyone? .....______ ___|______\_____ |/-\_________/-\_| .\_/...............\_/