I bought a new 2015 Ecodiesel six months ago and at 14,000 miles the motor has a real load knock when I was driving on highway. I had it towed to the dealer that I bought it from, and the tech said the motor is toast. Ram won't cover warranty because after doing a little research, we found out the that won't cover warranty (I bought the extended warranty) due to the wrong oil in motor. I bought the oil from other Ram dealer, gave them my VIN # and they gave us the filter and 2.5 gallons of oil. They're receipt has my VIN # on it, they gave me 15w-40 should've been 5w-30. Any advice? Lawyer up? Anyone else heard about this problem? Will different oil blow a motor in 4000 miles after change?