My new style has been working with WVO for 2 years now with 0 problems. I have the Mercedes Source kits in my 300SD and wish I had gone with a Frybrid system for just a couple hundred dollars more. The switch over valve are much better and it heats the oil much better. Kent's system seems to nickle and dime you i.e. you need this and then you need this and this and this. Frybrid's system is just that a system. I had a problem with the Pollack Valves from Mercedes Source and he wouldn't warranty them his comment was take it back to NAPA which is where he bought them, however NAPA wanted a sales slip. Mercedes Source wants you to buy your fuel filters from them and does not have a cross reference to any other mfg's products. I spent some time on the internet and came up with a list of about 70 other mfg's filters. I could go on and on about the disapointment in dealing with Mercedes Source but why just check out Frybrid.
www.frybrid.com