the reason for lower temp thermostats is to reduce nitrogen oxide emitions, in doing so engine efficnetcy is compromised, lucky for you the engine blocks have stayed simaler enough that the older higher temp thermostats still fit in alot of modles, it is often just one of the numbers in the part number that has changed, normaly the last I think, by skiming over part numbers, and paying attention to years you can often figur out what diget that is that is changed.
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