I'm not having a problem, but I just wanted everyone's input on what oil to use (SAE 30, 10W-30, Synthetic 5W-30, or 5W-30). I just bought a Husqvarna M-ZT61, it has the 30 HP Briggs and Stratton Endurance Commercial engine. It says to change the oil after 5 hours. I live In PA so the weather is not always warm. Any info is appreciated