Thermostats

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I've always gone with the stant superstat from Napa. However I recently picked one up from Napa and while it was heavy duty and said stant stamped on it didn't come in the blue and yellow superstant box, just a gray napa box.
 
We are seeing more and more Ford ones coming up as obsolete. The 3.0 Vulcan ones for the Rangers updated to a new number then went obsolete. It is a roll of the dice with what I can get aftermarket.
Is E5TZ8575C part number still showing available? Its the stat for the 6.9 and 7.3 IDI diesels. The OEM stat is the only one that seems to work in these engines. Guy have had all kinds of issues with aftermarket ones.
 
Is E5TZ8575C part number still showing available? Its the stat for the 6.9 and 7.3 IDI diesels. The OEM stat is the only one that seems to work in these engines. Guy have had all kinds of issues with aftermarket ones.
Readily available. A lot of diesel parts stay available thanks to International/Navistar making them for Ford until the 6.7L.
 
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