That's the only reason I'd be interested in using the newer fluid really, as I don't expect any benefits from the 2.5-3.0 liters of fluid I'd put back in after changing the filter.

However, I'd still really like to know whether or not it would be a bad idea to mix the two different formulas. Also, if makes a difference where I place the new, stronger, round magnet in the pan.

Anyone?

EDIT: I should also add that I've searched and searched the forums for the info about the compatibility or mixing of the two fluids before posting this question and found nothing more than the fact that the new fluid is backwards compatible with the older model transmissions (722.4/722.5/722.6). Knowing how finicky these transmissions are about the right fluid along with common knowledge about not mixing different formulas of coolant without a complete flush is keeping me from wanting to do this until if and when I get a confirmation that it is OK. Otherwise, I'll just go with the older fluid.

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2000 c280 Sport (looks like an upgrade, feels like a downgrade)
1991 190e 2.3 (sold)