Do not even think about climbing under a car that is held up by a scissor jack and cinder blocks! Scissor jacks have zero lateral stability and cinder blocks are too brittle. Yes, I too dropped a car on myself 20 years ago while doing exhaust work with a similar setup, three broken ribs from the rear axle crushing my chest, minor lung perforation, and two hours stuck trapped under the car until a passer-by heard my meek cries for help! That car didn't weigh HALF of what a 240 does.

You need at a bare minimum chock blocks for the front wheels two jack stands and a professional rolling floor jack to do this job safely.

jorrell
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92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!