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  1. Diagnosing A Failed (Stuck Closed) Thermostat

    E39 M5 and E52 Z8 Discussion
    Probably should make a post here about what I recently experienced on my 2001 E39 and my findings in diagnosing the problem. It started with strangely high engine oil temps but coolant temp was normal and gauge was dead center. I've never seen her oil temps run that high before, especially with...
  2. Undiagnosed Oil Temperature Issue

    E60 M5 and E61 M5 Touring Discussion
    I've been having oil temperature creep up uncomfortably past normal operating temperature. So far, I've replaced an oil cooler, oiler cooler hoses, radiator, thermostat, and the oil filter housing thermostat. Any ideas where to look next? Maybe just a bad temperature sensor? and if it's a...
  3. New Thermostat every year

    E39 M5 and E52 Z8 Discussion
    Hello everyone again I got a 2000 E39 M5 with yet another faulty Thermostat. I looked back at the my maintenance history and it seems that thermostats last me only one year. Is this normal $H!T that thermostats lasts only one year on S62?
  4. DIY: How to replace thermostat housing BMW V8 E39 M5 E52 Z8

    E39 M5 and E52 Z8 Discussion
    I replaced my 2000 E39 M5 thermostat housing o-rings last night and recorded the process in case it helps folks. Member Timmay77 posted a great tutorial here, so this video might be considered an attempted supplement. The process seems to be similar between the S62 implementation in the...
  5. Cannot get rid of Code P0128 on 2001 M5

    E39 M5 and E52 Z8 Discussion
    I cannot get rid of the Code P0128 "Coolant Thermostat Coolant temp below thermostat regulating temp". I am on my 4th mechanic. Thermostats replaced 3 times, temp sensor, water pumps (secondary pump done at the dealer) even my radiator. I had it finally at the dealer who said it was the Aux...
  6. Just did my thermostat

    E39 M5 and E52 Z8 Discussion
    Car was running cold and threw off p0128 code. Just wanted to say thanks for all the info on this forum, it sure made a heck of a difference. With that in mind I have a couple of suggestions that make this task easier (some of them were already mentioned in this forum, but this will hopefully...
  7. Gasket Makers Valve Covers Thermostat Housing

    E39 M5 and E52 Z8 Discussion
    I need to redo my thermostat because the Stant unit is leaking at the housing (NOT the O-ring tubes) I'm also going to be doing my Valve Cover gaskets and while i can get Drei Bond 1209 from a dealer @$22/tube I would like to just get Loctite & Permatex equivalents for the Thermostat housing I...
  8. Upper bounds of normal KTMP

    E39 M5 and E52 Z8 Discussion
    Okay, I have sifted through threads on the correct KTMP of our vehicles (I am referring to the read-out from instrument cluster test NR-07). I have seen folks complain that their car was not coming up to the suggested 79-degree Celsius threshold, which seems to indicate a failed thermostat in...