Thermostat, 80c. Fits all OM617 engines. May also fit OM616 as it was shipped to me as a part for a 240D. Brand new. Ebay item #140558691321

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=140558691321

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'95 Geo Metro 3-cyl 5-speed
'97 Geo Metro 3-cyl 5-speed x2
'81 Mercedes 240D 4-speed manual RIP