Back in the bay, on a workbench scarred with many small wars, Eli placed a new sticker where the old badge had been peeled away. He printed, in block letters: "Workshop Manual — W639." Under it, he wrote, in the same cramped script Josef had used in the margins: "Leave notes."

Comprehensive manuals typically include the following technical sections:

: Precise values for tightening bolts on critical components like brake calipers, engine mounts, and suspension links. Exploded View Diagrams

1. Professional Standard: Mercedes-Benz WIS (Workshop Information System)

| Source | Format | Pros | Cons | |--------|--------|------|------| | | Online subscription / DVD | 100% accurate, all TSBs, part numbers weekly updated | Expensive ($1000+/year), dealer-only access for live data | | Bentley Publishers | Printed book | High-quality, edited for DIY logic | Rare for W639 (only C/E/S-class focus) | | eManualOnline / Tradebit | PDF (500–3000 pages) | Affordable ($15–40), searchable text, includes wiring diagrams | Variable quality – look for genuine Mercedes reprints (with Daimler copyright) | | Auto-repair manuals (Haynes) | Printed | Cheap, good for basics | Lacks ECU pinouts, adaptation procedures, transmission overhaul details |