* Blown head gasket: This is one of the most common causes of gas in the oil. A blown head gasket can allow coolant and oil to mix, contaminating both fluids. This can lead to overheating and engine damage.
* Piston rings: Worn or damaged piston rings can allow gas to leak past into the oil. This can cause low compression as well as gas contamination of the oil.
* Valve seals: Worn or damaged valve seals can allow oil to leak into the combustion chamber. This can cause misfires and low compression as well as gas contamination of the oil.
* Cracked or damaged cylinder head: This is a less common cause of gas in the oil, but it can happen. A cracked cylinder head can allow coolant to leak into the combustion chamber, contaminating the oil.
It's important to note that these are just a few potential causes of gas in the oil and low compression. To determine the exact cause of the issue, you will need to have the engine inspected by a qualified mechanic.
