Last flush? Never. Probably hasn't been flushed since 1983. Definitely not since I owned it. How often should a flush be performed?

It's on my to-do list now. Up there with leaky oil cooler lines and new CV shafts. Moneypit. But I love her so.

While we are on the subject, what brake fluid is recommended for this vehicle?

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Vehicles:
2002 SLK 230
Gone but not forgotten:
1983 300D
1981 El Camino 'OILBRNR' - 6.2L diesel
OM617 powered '86 F150
1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel