About go-truck-yourself.com Part of your Duramax® diesel engine’s dirty secret is that it’s got a HUMP. The hump adds volume, so you can have more oil in your engine, but because 2 cups of oil are trapped in the HUMP, the oil gets filthy really quickly. WITHIN MINUTES OF RUNNING YOUR ENGINE after a fresh oil change, you’ll have black as tar oil again. The ONLY way to get rid of that filthy oil is to get a new oil pan without the HUMP. THE BANANA PAN IS THE BEST POSSIBLE UPGRADE YOU CAN DO FOR YOUR DURAMAX© THE BANANAPAN™ (AKA The Cleaner-Oil Hump-Killer)