Every time I read about your experience with your friend's shop, I can say for certain that those mechanics are NOT the kind of mechanics I'd want working on my 200.
I hear you
@CharlieS. To be fair, it was supposed to be 100% DIY (not that I trust that idiot, but at least he's conscientious). I didn't go there expecting them to help with the actual work - I was just there to use their lift and their oil catch pan. After the truck was in the air my friend (the owner) went back to whatever he was doing, but the mechanics just jumped in and started immediately removing the skid plates, as if I was an important customer in a hurry. I told them that I was going to do the work myself and that they could take a break, but I'm guessing they felt like they should do the work (for free) given my relationship there.
In their defense, they're good guys with lots of experience (not kids or newbies) who seem to know what they're doing; I know at least one is ASE certified (both I think). Their clientele is locals with old but working cars, and local commercial light trucks - regular maintenance, replacing brakes, fixing broken things, and "my 12 year old Ford/Honda/Hyundai is doing X, what is wrong? How much will it cost to fix?" type of stuff. I wouldn't take an M3 or 911 or race car there, or anything that would ever be going over 100MPH on a regular basis - I'd first try to do it myself, or go to a vetted independent specialist. But for dismounting damaged tires, plugging a puncture, replacing a broken rear air vent, replacing brake rotors and pads on a different leased GLS, I'm happy to give them the business. They do fine as a business, and have a stellar reputation in the area for making things right without ripping people off, but they are not trying to rival the Red Bull F1 crew in terms of precision.
On that point: I've spent plenty of years dealing with "factory trained" service from M-B, BMW and Porsche dealers, service at Japanese motorcycle dealers, trackside service providers (mainly tire mounting and balancing) (both car and bike), as well as working up close with two Porsche (lower end) race teams. I've seen top end work, high precision, real devotion and craftsmanship....and some pretty stupid mistakes...and in some cases, overt corner-cutting. I've seen mechanics at big shops break things and then try to hide it / patch it over, presumably to "move the metal" and get on to the next vehicle within a tight promised pickup time. Even the "high end" dealerships screw things up or have lazy / unscrupulous mechanics...stuff slips through all the time, even with multiple layers of management and "customer service" czars. Even the same dealership can produce dramatically different results from one visit to the next, because...humans.
A big part of the reason to get the Jowett filter body and drain plug setup is to make this kind of regular service easier for me to do in my driveway, without lifts, so that I can keep my 200 away from hamfisted mechanics, whether at a dealership or elsewhere. Some day my wife will let me build my dream race garage with 4 post lifts, plumbed in air lines everywhere, LED lighting, etc....until then I make do.
//Keeping it technical: does anyone know the correct inner diameter tubing to use with the accessory screw-in fitting for these ezdrain plugs? Is it 3/8"?