DOC'S DIESEL OIL + FILTER MAINTENANCE KITS – Doc's Diesel Oil + Filter Maintenance Kits have everything you need to make routine maintenance easy—fresh high-quality engine oil and all the necessary filters in one box. No guesswork, no extra trips. Timely changes reduce engine wear, improve fuel mileage, and help avoid costly repairs. Built for hardworking diesel trucks, these kits make it simple to keep your rig running strong and reliable for the long haul.
REPLACEMENT GUIDELINES - Always change according to your vehicle manufacturer's warranty. Fuel/Water Separators should be changed every 5,000-10,000 miles or 15,000 miles max. Oil Filters should be changed every 5,000-7,000 miles or 10,000-15,000 miles max. Engine Air Filters should be changed every 5,000-10,000 miles or 12,000 miles max. Cabin Air Filters should be changed every 15,000 miles or 12 months max. Transmission Filters should be changed every 25,000-50,000 miles or 60,000 miles max.
DOC'S DIESEL PREMIUM MAINTENANCE PARTS – Doc's is raising the bar for aftermarket parts with premium filters, brakes, hubs, wiper blades, and engine oil—all built to meet or beat OEM standards. Proudly based in Northwest Ohio, they're a grassroots team focused on real-world performance, long-term reliability, and honest value. Count on Doc's to keep your truck ready for the road.