To find the oil capacity for your Peugeot 407 1.6 HDI engine, you should:
1. Consult your owner's manual: This is the most reliable source for specific information about your car. The oil capacity should be listed in the maintenance section.
2. Check the dipstick: If you can't find the information in your manual, you can check the dipstick. The dipstick should have markings indicating the minimum and maximum oil levels. The difference between these markings is the oil capacity.
3. Contact a Peugeot dealer or mechanic: If you still can't find the information, contact a Peugeot dealer or a qualified mechanic. They will be able to provide you with the correct oil capacity for your specific engine.
Important note: Always use the correct type and amount of oil recommended by the manufacturer. Using the wrong oil can damage your engine.