Mitsubishi L200 4D56 (2020) ❗ engine has bad oil leaking❗, here’s how to diagnose and fix it — step-by-step 👇 🔍 Common Oil Leak Points (4D56 engine) 1. Valve cover gasket Most common cause — gasket gets hard or cracked. Look for oil around the top of the engine or running down the sides. 2. Oil filter / oil cooler Sometimes oil filter not tightened properly or oil cooler O-ring damaged. Check near the oil filter area (right side of the engine). 3. Oil pan gasket or drain plug Look under the en