Owner's manual on my recently-acquired 2006 says 15 years/150k miles. Isn't this stuff Zerex G05? I didn't think coolant of any kind could last that long. What's the deal?

I keep finding surprises with this car. I'm just not used to something with such a non-needy maintenance schedule.

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL