DOC'S DIESEL COMBO KITS - Doc’s Diesel Combo Kits save you time and money by giving you the filters you need in one convenient package. No more running around trying to find the right parts. Just grab a kit and get the job done! Swapping filters on time keeps your truck running strong and efficient, and with our Combo Kits, it’s easier than ever.
REPLACEMENT GUIDELINES - Above all recommendations, change according to your vehicle’s manufacturer's warranty. Fuel Filter/Water Separators: Every 5,000-10,000 miles or 15,000 miles maximum. Oil Filters: Every 5,000-7,000 miles or 10,000-15,000 miles maximum. Engine Air Filters: Every 5,000-10,000 miles or 12,000 miles maximum.