5 quarts of Valvoline Max Life, 1 quart of Lucas, 1 K&N oil filter every 3,000-3,200 miles, or before and after a big trip. 184,000 miles later, my Chevy 5.3L bottom end still shines like new. Trans-fluid every 10,000. Differential and transfer case fluids every 20,000 or at least once per year...