are you crazy?? Dont even think about it for 600 bux. One of the best synthetic oils - Amsoil Severe Gear Oil will run you $100 top (about $14 per liter @ Peavey Mart). Washers + hand pump about $20 more. Thats it! Oh yeah, and may be an 2 hours max doing it yourself. Most of the time you will be pumping oil, its almost as easy as changing engine oil. There is procedure with pictures in Maintanance section with great pictures, very few tools required. Good luck