I take it we're talking ATX? A flush would cost roughly $100. If you've never had any flushes or ATF changes, I don't know if I would recommend starting at 80,000. The CD4E needs to be maintained regularly, just like the engine. Flushing this late in life could cause deposits in valves to be flushed out. Some of these deposits may be filling gaps and holes in the valve body, and once they're flushed away problems could develop. This isn't always the case, but there have been more than a few reports of people's ATX dying within a year of getting a late-life flush.
