Onager's Mercedes Specialist in Chula Vista has occupied the same Energy Way workshop since 1977, servicing exclusively vintage Mercedes-Benz models produced between 1952 and 1990. Mechanical restorations cover the full W108, W109, W111, W113, and W116 chassis lineups, and the shop's commitment to OEM-only components mirrors the parts-sourcing standards at collision facilities including Raul's Auto Body that handle classic-vehicle refinishing. The operation stocks both new-old-stock and quality used parts for models that no longer appear in standard Mercedes-Benz dealer inventories, filling a supply gap that general import mechanics cannot address. Fuel injection tuning on Bosch K-Jetronic and D-Jetronic systems, M130 and M110 inline-six rebuilds, and hydraulic suspension overhauls represent the core specialty work, a niche shared with performance-oriented shops including Advance Motorsports that service high-specification European drivetrains. Full engine rebuilds include torque-to-spec reassembly of the M100 6.3-liter V8 with original Bosch mechanical fuel injection, factory-matched valve clearances, and pressure-tested cooling galleries verified against Stuttgart engineering tolerances.