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What could cause oil in your coolant resivoir but no a new engine 2001 ford lightning?

1. Head gasket failure: A blown head gasket can allow oil to leak into the coolant system. This is a serious issue that can lead to engine damage. Symptoms of a blown head gasket include:

- White or milky-looking coolant

- A drop in coolant level

- Overheating engine

- Rough idling

- Misfires

- Exhaust smoke

2. Damaged oil cooler: The oil cooler is a small radiator that helps to keep the engine oil cool. If the oil cooler is damaged, it can leak oil into the coolant system. This can cause similar symptoms to a blown head gasket.

3. Cracked cylinder head: A cracked cylinder head can also allow oil to leak into the coolant system. This is a rare occurrence, but it can happen if the engine has been overheated or otherwise damaged.

4. Faulty oil filter: A faulty or damaged oil filter can allow oil to bypass the filter and leak into the coolant system.

5. Water pump seal failure: A failed water pump seal can allow coolant to leak into the engine oil. This can also cause the oil to appear milky or white.