Drew Callahan · January 8, 2026
Diesel Engine Oil and Filter Service for NEWMAR DUTCH STAR I’m underneath the Dutch Star, oil drain pan positioned, socket fitted to the plug, and I can already tell by the color of what’s about to drain that the previous owner ignored the service schedule entirely. The oil that starts flowing is nearly black—darker than … Read more
Drew Callahan · January 7, 2026
Diesel Engine Oil Service for TIFFIN ZEPHYR I was three weeks into a stretch through the high desert when the oil pressure gauge started creeping lower than it should on flat ground. Nothing dramatic—just enough that I knew something had shifted. Pulled into a dusty BLM lot outside Moab, popped the engine hatch, and realized … Read more
Drew Callahan · January 7, 2026
Diesel Engine Cooling System Service for TIFFIN ALLEGRO BUS Tiffin Allegro Bus owners living in the Southwest or running extended boondocking seasons hit a wall around 70,000–90,000 miles when the cooling system decides to leak. Not dramatically — just a slow, persistent weep from the lower radiator tank or a water pump that’s crying a … Read more
Drew Callahan · January 5, 2026
Diesel Engine Oil Service for AMERICAN COACH AMERICAN EAGLE I had my American Coach parked in a dusty lot outside Moab last spring when the oil analysis came back flagged—not catastrophically, but enough to tell me I’d waited too long between changes. That’s when it hit me that most full-timers either nail the diesel service … Read more
Drew Callahan · January 4, 2026
Diesel Engine Oil Service for NEWMAR KING AIRE If I pull the dipstick on a King Aire that hasn’t seen an oil change in two years, what I find tells the whole story: oil the color of burnt coffee, thick enough to coat the stick like tar, and a smell that’s part diesel fuel, part … Read more
Drew Callahan · January 3, 2026
Diesel Engine Oil Service for FLEETWOOD DISCOVERY I’ve got my socket on the drain plug, and I can already feel the heat radiating off the oil pan—this Fleetwood Discovery’s diesel has been running hard, and the oil coming out is going to be thick and dark. I’m going to walk you through exactly what I’m … Read more
Drew Callahan · January 2, 2026
Diesel Engine Oil Service for FOREST RIVER BERKSHIRE A single missed oil service interval on a Forest River Berkshire can cost you $18,000 to $35,000 in engine replacement — and that’s if you catch the damage before the block cracks. I’ve walked through enough engine bays across my 80,000 miles to know that diesel pushers … Read more
Drew Callahan · January 1, 2026
Diesel Engine Oil Service for THOR PALAZZO The Thor Palazzo diesel pusher sits at an awkward middle ground — it’s heavy enough to demand real diesel maintenance discipline, but just small enough that owners sometimes treat it like a gassed-up Class C and skip intervals or grab whatever 15W-40 is on sale at the truck … Read more
Drew Callahan · December 30, 2025
Diesel Engine Oil Service for WINNEBAGO FORZA Most Winnebago Forza owners assume that dropping a Cummins or CAT diesel under the hood means they can coast on maintenance—that the name plate alone buys them time. That’s backwards, and it’s expensive. The Forza sits at a price point where the builder cuts corners on what matters … Read more
Drew Callahan · December 29, 2025
Diesel Engine Oil Service for HOLIDAY RAMBLER NAVIGATOR I can pull the dipstick out of a Holiday Rambler Navigator’s engine right now and show you exactly what skipped oil service looks like—a thick, tar-black paste coating the stick, metal particles visible to the naked eye, and a smell that tells you the oil broke down … Read more
