ive looked all over the place for the recommended oil for our trucks with no luck, So i went to pepboys and bought 0w-30. I changed the oil and all of the sudden it developed an oil leak. I looked around and found just below the air box (im no mechanic) the square box thing with the 2 hoses was saturated with oil and it looked fresh. i changed the oil last week and its already just above the min mark on the dipstick. any ideas?