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Discussion Starter #1
Hi all,

Been a while since i posted to this forum, last time i posted i had my E46 what a motor that was I miss it everyday, anyway I'm wondering if anyone can help me I have searched everywhere and cannot find an definitive answer with the issue on my E60.

When i first brought my car I realised that it wasn't getting upto temperature through the hidden menu so i decided to change both EGR & main thermostat with genuine Behr parts that seemed to improve the mpg slightly and heat inside the cabin was alot better also coolant temperature improved, however now winter has approached I'm getting around 20mpg and cars reaching low 80 degrees, once warmed it does get to around 85 degrees but that's only if you drive like a grandad but then if you come to a stop it drops to between 80-82 it's even worse if you floor it then it drops straight down to low 70s and then takes an age for it to rise back up.

I was reading on various forums that the auto box has an heat exchanger oil cooler with an inbuilt thermostat part number 17217803830 that can contribute to car not heating uo efficiently so that is my next item to replace I'm just curious has anyone else replaced this part? also does anyone know what to expect when changing it will i lose transmission oil and coolant in the process of swapping the part? or one or the other? I'm interested in keeping the thread going and finding a solution so it can help others in the future as like i stated previously there's plenty of posts on this subject but not any real solutions. Any help would be greatly appreciated as I'm eager to fix my car and help others in the community.

Thanks - kornboi
 

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Had many auto box diesels but never had to change that stat.
However i have had and seen a few Behr/Mahle and BMW bought stat's fail after several months it can and does happen.
 

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Discussion Starter #4
Had many auto box diesels but never had to change that stat.
However i have had and seen a few Behr/Mahle and BMW bought stat's fail after several months it can and does happen.
Thanks for your reply.
 

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If its any help - i ve had several gearbox stats go and after last one I had a gearbox service just in case oil was low. One of best recommendations i ve acted on from this forum.
 

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Discussion Starter #7
If its any help - i ve had several gearbox stats go and after last one I had a gearbox service just in case oil was low. One of best recommendations i ve acted on from this forum.
Thanks for your reply, which brand of gearbox thermostat did you buy? I have a few choices on autodoc such as Nissens, TruckTec, Meat & Doria, NRF, Mahle etc. I know it's been mentioned to use genuine brands but I read the OEM gearbox thermostats have a fault, out of curiosity what was the mileage of your car when you got your gearbox oil changed? also, were you down on gearbox fluid before the gearbox service? I have been watching BMW doctor on YT and he recommends never to change your gearbox oil as it can potentially blow up the box and cause issues.

Link to video here: Don't EVER TOUCH The Transmission On Your BMW !! - YouTube
 

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There are many sound reasons why "BMW doctor" is wrong about never changing the gearbox oil. No need to go into them all here. The advice I would give though is get it done by a specialist. There is more to it than just dropping the old oil out and refilling.
 

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I had them replaced under warranty so were oem . However it is fair to say i am unimpressed by their longevity. You might be better non oem imho. The oil was replaced at i think 53 k and I endorse snowblind s opinion - it definitely improved the gear changes changes .
 

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every gearbox ever invented should be serviced,,simples,first thing i did on my e92 335d and 640d
 

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I'm gonna be off-topic but I really wanna say this... The issue I have with this channel (BMW doctor) is how he amplifies every issue you could have or every little maintenance routine you could ever think of.

"DON'T do this, it will BREAK your engine !"
"DON'T do that, your transmission will FAIL !"

Best example about this is how he once said that every windshield washer pump that fails is because of an expensive and annoying-to-reach electronic module placed in the glove box (he has a video about it)... despite many E60 owners saying all around the internet that all they had to do was replacing said washer pump and boom, everything was working fine again. It's all about wording, it's a good tip to think about this module and tell people about it, but common sense is, you know, to focus on the pump first, especially when it's such a cheap item, you can't go around and tell everyone "nah, no need to replace the pump, kick that expensive module out for a used or new one asap".

I'm sure he has good intentions, but someone should just tell him... "Dude, calm the foot down".
 

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Humans respond to dramatic presentation. Click-bait is just a manifestation of that. Tabloid headlines are another.
"Shock! Horror! Hell fire and Damnation! Exploding Controller Module will Destroy! Your! Car! and Break! Your! Bank Account!" will get more attention than, "Water pumps break. Here's how to fix them". And if you stick some unrelated stock photo images of unfeasibly attractive flesh into the background it never hurts. We're simple creatures.

But back to the main topic, might I suggest checking out the EGR? The way it operates is to feed back some of the exhaust gases into the inlet and it does this to reduce the temperature of the combustion products in the cylinders.
The goal is to reduce the production of nitrogen oxides of course. However, if the valve isn't function correctly you could be running with the thing stuck partially open so the motor is running cooler than normal.
 

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Discussion Starter #13
I'm gonna be off-topic but I really wanna say this... The issue I have with this channel (BMW doctor) is how he amplifies every issue you could have or every little maintenance routine you could ever think of.

"DON'T do this, it will BREAK your engine !"
"DON'T do that, your transmission will FAIL !"

Best example about this is how he once said that every windshield washer pump that fails is because of an expensive and annoying-to-reach electronic module placed in the glove box (he has a video about it)... despite many E60 owners saying all around the internet that all they had to do was replacing said washer pump and boom, everything was working fine again. It's all about wording, it's a good tip to think about this module and tell people about it, but common sense is, you know, to focus on the pump first, especially when it's such a cheap item, you can't go around and tell everyone "nah, no need to replace the pump, kick that expensive module out for a used or new one asap".

I'm sure he has good intentions, but someone should just tell him... "Dude, calm the foot down".
Yeah i agree he does come across as ignorant some of his videos.
 

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Discussion Starter #14
Humans respond to dramatic presentation. Click-bait is just a manifestation of that. Tabloid headlines are another.
"Shock! Horror! Hell fire and Damnation! Exploding Controller Module will Destroy! Your! Car! and Break! Your! Bank Account!" will get more attention than, "Water pumps break. Here's how to fix them". And if you stick some unrelated stock photo images of unfeasibly attractive flesh into the background it never hurts. We're simple creatures.

But back to the main topic, might I suggest checking out the EGR? The way it operates is to feed back some of the exhaust gases into the inlet and it does this to reduce the temperature of the combustion products in the cylinders.
The goal is to reduce the production of nitrogen oxides of course. However, if the valve isn't function correctly you could be running with the thing stuck partially open so the motor is running cooler than normal.
Thanks for your reply, i had the throttle body replaced and replaced the EGR valve around October time
 
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