I'm about to replace the glow plugs on my '96 E300 and I noticed that Fastlane offers two different types of Bosch plugs: Glow plug Duraterm and regular regular. Which should i get? Is there any difference? Also are there any tips out there on this procedure? I've done alot of work on the older diesels before, but I've never worked much on the newer ones yet. I know the intake has to come off I was quoted $600 dollars to have it done. I know I can do it myself, but I just need the time to do it. A service manual would be nice too. Thanks for any help!!!