Keep your R107 on the road — one good decision at a time.

Why this site exists

The information is already out there. This site helps you use it.

Factory service manuals, Kent Bergsma's three decades of articles, the MBCA Star archive, and forum threads where someone diagnosed your exact problem in 2009 — almost everything an R107 owner needs already exists. It's just scattered across a dozen tabs on a Saturday afternoon. R107 Workshop is a guided, diagnosis-first path through those resources, organized so a real repair decision actually comes out the other end — whether you're new to the car or thirty years deep.

• Diagnose first

  Every symptom opens a decision tree, not a parts list. Cheapest, most informative checks come first — multimeter, vacuum, smell, code pull — so the part you order is the one the car actually needs.

• Right resource at the right time

  Tonk for a torque value, MercedesSource for a procedure, Peach Parts for a real-world failure history, MBCA Star for the deeper context. The decision tree points you to the one that fits the moment.

• Smarter parts and tool decisions

  Part recommendations are tied to your engine, year, and market — early D-Jet vs late KE-Jet, US vs ROW, R-12 vs R134a — with notes on when OEM matters and when a quality aftermarket part is the better call.

• More owners, more capable

  Plain-language steps, defined terms, and a clear next action at every branch. The goal is more owners feeling confident enough to keep their car on the road — whether that's in their own garage or with a trusted shop.

We're not trying to replace the forums, the manual scanners, the parts catalogs, or the independent shops who keep these cars alive. We point at them, credit them, and try to make them easier to use. The R107 ecosystem is a collaboration — this site is a small part of it.

Who this is for

Built for R107 owners at any experience level.

These cars deserve to stay on the road, and that shouldn't depend on whether you grew up in a workshop. The same decision tree works for a first-time owner and a thirty-year independent tech — it just gets read at different depths.

• New to the R107

  Clear symptom pages with a defined next step at every branch. Specialist terms get a one-line definition the first time they appear — no jargon walls, no assumed shop background.

• Weekend wrenchers

  Maintenance schedules, torque values, and repair sequences laid out so a Saturday in the garage actually closes a job out instead of opening three more.

• Experienced enthusiasts

  Citations to factory manuals and fuel-injection-specific branches (D-Jet, K-Jet, KE-Jet), plus vacuum and wiring references. Skip the basics, jump straight to the test.

• Anyone deciding before they order

  Diagnose the symptom before the parts cart fills up. Each leaf names the most likely cause, the cheapest confirming test, and the right grade of part for your year and market.

References & suppliers

We index the community, we don't replace it.