I have an 2004 4.3L V-6, Mercruiser I/O, at 190 Hp. I changed the oil at 30 Hours, and for pre wintereization, but can not locate the oil filter... I have been to every square inch of the motor, and can not find it..? I found the fuel filter on the front starbord side of motor..(looks like an oil filter, but it says fuel filter on it) Any help? Is it possible they don't use oil filters on these?