I'd like to flush the tranny oil on my 99 SLK230K A/T : what kind of oil can be used for that transmission other than the lifetime MB product?

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From 300CE to SLK230K

No such thing as "lifetime" product!
Even MB now suggests every 40K mile trans fluid changes.

Use MB fluid part number 001-989-45-03-10 OR 001-989-68-03-10.

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only mb. some people claim to have met or exceeded mb specs on the mb fluid, but i don't think they'd buy a trans if their fluid did not hold up. too risky for me. good luck, chuck.