Disadvantages
From a strictly engineering perspective, the dry sump is a superior solution, however with real-life economic considerations, where cars have to be built inexpensively, the wet sump is preferred. Dry sump systems add cost and complexity and the extra pumps and lines require more oil, so maintenance costs rise accordingly. Also, the performance-enhancing features of dry sump lubrication can have negative implications in a car's day-to-day driveability. A good example is the classic Mercedes-Benz 300SL, a car that was designed for racing but sold to the general public and used on-road. The car had great oil capacity in a dry sump system to cope with continuous high-speed running while racing. However, in general use, owners found that the oil never achieved the correct operating temperature because the system was so efficient at cooling the oil. A makeshift solution was devised to deliberately block the oil cooler airflow to boost the oil temperature.
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