I'm jacking up the engine right now for my oil cooler line job as well as making removal of the driver's side mount easier, but something doesn't seem right.

When I jack the engine underneath the oil pan (with a block of wood) the entire car stars to jack upward. I have removed the two 8mm bolts.

Is this normal? I have the car on ramps and I don't want to be working under a safety hazard as well as breaking something.

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-Typos courtesy of my mobile phone.