It's nice that all those engine mfr's have backed the Delo coolant, but there's one notably missing: Mercedes-Benz! MB only specs MB coolant for their engines, period. The problem isn't aluminum in the system, it's the PLASTIC in the MB radiators (and aux heater pumps, etc.) Although the Delo may not cause any problems short term, I'd switch back to OE dealer coolant from MB at the next change. It's available from Internet retailers for $10/gallon, which is cheaper than the Delo as you only need 1 gallon per car (unless you live in a REALLY cold area).
Just don't EVER EVER use the orange Dex-Cool garbage! Do a search on Google, there's some scary horror stories on this stuff. NOBODY has ever had a problem with the MB coolant, although the "green" coolants have cause problems in MB's with the plastic turning brittle & seals leaking.
HTH,
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