Yeah I understand that it uses less oil and is more efficient, but you are gunna pick up "dirt or whatever" with or without premixing your gass. The oil in the gas tank isn't like a magnet for picking up dirt and sucking it into your carbs. Alot of general users wouldnt ever think to have to replace oil lines, because why should they ever fail? And in all honestly, i dont know why they should fail. Does anyone ever have to replace oil or gas lines on their car because they are broken or deteriorating? No. So to the casual PWC user, why should you ever have to replace them in a Seadoo?