How does a dry-sump lubrication system differ from a traditional wet-sump system?

1. Dry-sump systems do not use liquid engine oil.
2. Dry-sump systems store oil in an external reservoir tank rather than in the oil pan.
3. Dry-sump systems rely solely on oil splash lubrication without an oil pump.
4. Dry-sump systems eliminate the need for a pressure relief valve in the oil pump assembly.