mindi, in the 4 stroke engines they change the engine oil, most of the manufacturers use synthetic oil which tends to drag the price up a little. you will prob start another 2 stroke vs 4 stroke war here so you can be assured you will see many more posts, best thing i can suggest is try to find a few guys on here that are willing to take you for a spin and see the difference in the engines. each of the engines have their highs and lows. for mine i wont go past the 2 stroke just because of maintenance. if you are reasonablt mechanically minded you can do the lot yourself pretty easily. most of the costs you see in the servicing prob does not include spark plugs as they are platinum and they tend to hit you with those during if not included, i had a 100 hour service on my di evinrude and they rang me during and hit me for another $90 worth of plugs, ever since i do it all myself, much easier. cheers lethal