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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. Overheating, Possible fan issue

    E39 M5 and E52 Z8 Discussion
    Hopefully someone here has encountered this before. My 02 M5 has started to overheat, so after replacing the Thermostat and the two associated temperature sensors it's still not behaving it's self. Ran it through a diagnostic computer and the error "053 Fan Activation" appears, also when using...
  4. M5 Potential Engine Damage – Need Advice

    E60 M5 and E61 M5 Touring Discussion
    Hello Everyone – New here, but need some advice. I bought a 2009 M5 the 1<SUP>st</SUP> week of March. Certified pre-owned with about 35k miles on it. The car looked like it had just come from the factory and was running perfect. After having it 3 weeks (and only a few hundred miles since...