For enthusiasts considering a classic Mercedes-Benz roadster, the 380SL (R107 chassis) often comes into view. While celebrated for its enduring design and open-top cruising experience, like any vehicle of its age, understanding potential maintenance points is crucial. Here’s a breakdown of key areas to consider when evaluating a Mercedes 380sl.
Timing Chain Concerns
Early models of the 380SL were equipped with a single-row timing chain, a design that was updated to a more robust double-row chain in later production years, around 1984. Retrofitting the double-row chain to earlier models is a significant undertaking, potentially costing around $3,000. Regardless of the chain type, regular maintenance of guides and tensioners is essential to prevent timing chain issues, though servicing the double-row system is considerably less expensive.
Suspension Wear
The Mercedes 380SL, while not excessively heavy, is a substantial vehicle. Over time, and especially if left standing for extended periods, the suspension components are prone to wear. Prospective owners should anticipate potential replacement of shocks (Bilstein is a well-regarded brand), subframe bushings, ball joints, and springs to ensure optimal ride quality and handling.
Bosch CIS Fuel Injection Challenges
The 380SL utilizes the Bosch CIS (Continuous Injection System) fuel injection system, common in many European cars of the era, including the Porsche 911. While generally reliable, CIS systems can develop cold, warm, and hot start problems over time. Troubleshooting idle irregularities, starting difficulties, and engine misfires in the CIS system can be complex and costly if not properly diagnosed.
Complex Climate Control
The climate control system in the 380SL is known for its intricate design and potential for issues. Often described as unnecessarily complicated, the system is vacuum-operated, with vacuum actuators located behind the dashboard. These actuators can be rebuilt affordably, but accessing them and identifying the problematic component can be challenging. A common failure point in the heating system is the monovalve, which thankfully is inexpensive and relatively easy to replace if heat suddenly stops working.
Rust Vulnerability
While not among the most rust-prone vehicles, the 380SL, as an older car, is susceptible to rust. Key areas to inspect include around the headlight buckets and the lower sections of the doors. It’s important to remember the rule of thumb: the visible rust is often only a fraction of the underlying corrosion that may need attention.
Convertible and Hard Top Simplicity
One positive aspect of the 380SL is its well-designed and mechanically straightforward convertible top. The hardtop is equally well-engineered and relatively easy to remove and reinstall, with many owners utilizing a homemade winch system for convenient storage and handling.
Interior Issues
Dashboard cracks are a common interior issue, particularly in blue dashboards, which seem to be more prone to this problem than other colors.
Radiator Problems
Radiators, especially those with plastic filler necks, are another area of potential concern. The plastic necks can become brittle and break, often proving difficult to repair and necessitating radiator replacement, which can be costly.
Becker Radio
The original Becker radios in these cars are of their era. Enough said. (Likely implying they are outdated or prone to issues).
Like any classic car, the condition and maintenance history of a Mercedes 380SL are paramount. A well-maintained example will generally provide a more enjoyable ownership experience. The 380SL is not a high-performance sports car, but rather a comfortable and stylish convertible cruiser that offers a classic roadster feel. For those seeking more collectible models, the earlier 113 chassis SLs (230SL, 250SL, and 280SL from 1963-1971 in the US market) are often highly desirable.
Finally, for anyone considering purchasing a Mercedes 380SL, a Pre-Purchase Inspection (PPI) from a qualified independent Mercedes-Benz technician is highly recommended. A thorough inspection of the electrical, mechanical, and fuel systems, as well as the body, can be an invaluable investment, potentially saving significant expense and trouble in the long run.
