[M8Bimmer]

Well I finally bit the bullet and ordered the raw tank. As opposed to the black coated one. I think the silver color will look good. A contrast anyway.
Very nice folks at RK Autoworks !! Very helpful and responsive. FAST shipping.
Shipped this morning and arrives here on Thursday. Although my car is still asleep til the snow is gone for sure.
So I have a question that you guys might know.
I have one of the IND billet coolant caps on my res now. Can we use those on these billet tank units. Is the OEM cap a pressure relief type? Should we be using the billet units at all? I don't think they are pressure relieving.
Does this billet tank vent somehow if needed?
The pics show it with a stock cap on it.
Waz up with this venting stuff boys?

[Dr Thrillride]

Originally Posted by M8Bimmer

Well I finally bit the bullet and ordered the raw tank. As opposed to the black coated one. I think the silver color will look good. A contrast anyway.
Very nice folks at RK Autoworks !! Very helpful and responsive. FAST shipping.
Shipped this morning and arrives here on Thursday. Although my car is still asleep til the snow is gone for sure.
So I have a question that you guys might know.
I have one of the IND billet coolant caps on my res now. Can we use those on these billet tank units. Is the OEM cap a pressure relief type? Should we be using the billet units at all? I don't think they are pressure relieving.
Does this billet tank vent somehow if needed?
The pics show it with a stock cap on it.
Waz up with this venting stuff boys?

I can’t answer your questions because there’s too many. lol. I don’t think the billet units would sell if they didn’t do the job and it seems lots of owners buy this sort of bling. I may get me a set, but I’ll ask my shop.

[M8Bimmer]

Originally Posted by Dr Thrillride

I can’t answer your questions because there’s too many. lol. I don’t think the billet units would sell if they didn’t do the job and it seems lots of owners buy this sort of bling. I may get me a set, but I’ll ask my shop.

Cool Man
I have the coolant cap but it's on the car in storage right now til the spring.
I just don't recall seeing a pressure relief device in the cap. Hopefully somebody here has a definitive answer. Honestly I don't even know if the OEM cap has the valve either. I don't have one here to check.
Maybe some of the guys that already installed one of these tanks will know??

[FinnyMcC]

Surprising the expansion tank is a different part number for the M850i. Same problem with both tanks?

[Dr Thrillride]

Originally Posted by FinnyMcC

Surprising the expansion tank is a different part number for the M850i. Same problem with both tanks?

We haven’t seen many report it here. One of our members reported it in another forum.

But, all things plastic seem to have a high likelihood of failure. Mine didn’t have issues but I track the car and was amazed at the temps on the exhaust side after using a good quality IR camera. If it does leak, what a friggin’ mess, so it’s a bit of prevention from my point of view. No downside except the cost for the part. Installation in an hour. That’s it.

[M8Bimmer]

Originally Posted by Dr Thrillride

We haven’t seen many report it here. One of our members reported it in another forum.

But, all things plastic seem to have a high likelihood of failure. Mine didn’t have issues but I track the car and was amazed at the temps on the exhaust side after using a good quality IR camera. If it does leak, what a friggin’ mess, so it’s a bit of prevention from my point of view. No downside except the cost for the part. Installation in an hour. That’s it.

Ya I got mine this morning. I agree, preventative maintenance.
I guess I'll have a 22k plastic unit for sale. Never leaked yet. But we don't get the crazy hot days here they do in the southern states.
If it's 90f here that considered HOT. But I'm also along termer on this car so figured WTF. Can't hurt and can only add to the reliability long term.
It'll will be installed in about 2 months.

[FinnyMcC]

Originally Posted by Dr Thrillride

We haven’t seen many report it here. One of our members reported it in another forum.

But, all things plastic seem to have a high likelihood of failure. Mine didn’t have issues but I track the car and was amazed at the temps on the exhaust side after using a good quality IR camera. If it does leak, what a friggin’ mess, so it’s a bit of prevention from my point of view. No downside except the cost for the part. Installation in an hour. That’s it.

Thanks. I would do it, but the part supposedly doesn't fit the M850i.

[M8Bimmer]

Originally Posted by FinnyMcC

Thanks. I would do it, but the part supposedly doesn't fit the M850i.

That is a bit odd. Maybe somebody here knows why. Or ask RK themselves. I found them very helpful.
I highly recommend to ask them. Maybe it will with some other mod made. They'd know why it won't anyway.

[FinnyMcC]

Originally Posted by M8Bimmer

That is a bit odd. Maybe somebody here knows why. Or ask RK themselves. I found them very helpful.
I highly recommend to ask them. Maybe it will with some other mod made. They'd know why it won't anyway.

Yeah that is where I got the info from. But honestly, if it's not a big problem in the M850i and I keep the car I will just proactively swap out the tank for a new one. If I do I will put heat shield material on the bottom of the new one. Not a hard job.

[M8Bimmer]

So I opened my tank box today. Wow! What a nice piece of manufacturing expertise.
It's a thing of beauty for sure. Almost too nice to hide away. Solid as hell. Heavy too.
Quite the amazing workmanship imo.
I'm actually thinking that for the money it's a lot of value. Looks hard to make to me.
They even have a FULL or LOW indications carved out in letters down inside under the lid. Easy to tell what level your at.
I'm impressed with this unit for sure. It could sit on a shelve to admire almost. Gonna be nice piece of mind once installed.
Bravo RK ! Nice work!

[Humy]

How many hours would a shop charge to swap out the coolant tanks?

[Dr Thrillride]

Originally Posted by Humy

How many hours would a shop charge to swap out the coolant tanks?

1-2 hours. Very simple as per video

[KillerBlackRhino]

Ordered the black one to match. Looks like an easy install. Hopefully by next week!

[KillerBlackRhino]

Installed. Looks great.

[Dr Thrillride]

Originally Posted by KillerBlackRhino

Installed. Looks great.

Looks good. Where did you buy those red billet caps?

[KillerBlackRhino]

Originally Posted by Dr Thrillride

Looks good. Where did you buy those red billet caps?

Thank you!
IND. They are really covers that fit on top With 3M tape.
I did gas cap as well.

[M8Bimmer]

I did all those same red caps.

[brokeboi]

Has anyone monitored the coolant temps with the billet tank and compared it to the temps with the OEM tank? I want to know if temps get higher in the aluminium tank.

I'm looking forward to seeing long term reviews on the RK tank. Ordering from Europe, it ends up costing 10x the cost of the OEM plastic tank, so I want to be 100% sure that it doesn't leak at all.

[Dr Thrillride]

Originally Posted by brokeboi

Has anyone monitored the coolant temps with the billet tank and compared it to the temps with the OEM tank? I want to know if temps get higher in the aluminium tank.

I'm looking forward to seeing long term reviews on the RK tank. Ordering from Europe, it ends up costing 10x the cost of the OEM plastic tank, so I want to be 100% sure that it doesn't leak at all.

This is low temp cooling and is enhanced by bigger intercoolers (Wagner Tuning) and additional low temp rads (Carbahn). The reservoir has no affect on temp. Its main purpose is leak elimination.

[mbdelta]

Originally Posted by FinnyMcC

Thanks. I would do it, but the part supposedly doesn't fit the M850i.

Originally Posted by M8Bimmer

That is a bit odd. Maybe somebody here knows why. Or ask RK themselves. I found them very helpful.
I highly recommend to ask them. Maybe it will with some other mod made. They'd know why it won't anyway.

Did you get any reply from RK? My M850i had this problem before.

[fabi8]

On my 2020 m850i the same, got a leaking coolant plastic tank. Interestingly, the bmw replacement tank was having a slight different design and different oem part number as far as I can recall it. I got pretty lucky to randomly spot it early.

[Justao]

Originally Posted by fabi8

On my 2020 m850i the same, got a leaking coolant plastic tank. Interestingly, the bmw replacement tank was having a slight different design and different oem part number as far as I can recall it. I got pretty lucky to randomly spot it early.

Unfortunately the new reference coolant tank has the same issue…