What is the spring next to oil filter on vs commodore?

The oil filter bypass valve is designed to open if the oil filter becomes blocked. This can happen if the oil is dirty, or if the filter is damaged. If the valve opens, oil can flow around the filter, ensuring that the engine continues to receive oil.

On most vehicles, the oil filter bypass valve is located on the oil filter itself. However, on some vehicles, including some Holden models like the Commodore, it is located on the engine block, next to the oil filter.

If you're not sure where the oil filter bypass valve is located on your vehicle, you should refer to the owner's manual.

It is important to note that the oil filter bypass valve is a safety device. It should not be opened intentionally. If the oil filter bypass valve opens, you should replace the oil filter as soon as possible.