Expansion tank

[skmattwell]

Probably a noob question but am confused over expansion tank numbers and don't want to end up ordering the wrong thing.

Are part numbers 17117573751 and 17117573781 the same thing?

 

[patriot66]

Recently fitted a new Febi Bilstein expansion tank and as you can see the BMW part number on the box is 17117573781.
Excellent quality, perfect fit and working fine

 

[enuff_zed]

Realoem seems to suggest the second number came in around 2007 and superseded the others.
I suspect there's no real difference.

 

[skmattwell]

Excellent, the older model is about £30 more expensive for some reason, I owe you both a pint!

 

[grannyknot]

The tank number ending in 751 is listed as a Z4 part, the tank number ending in 781 is listed for the E46, E83 and E53 it also has a little flange at the top, don't know if that would make any difference though.

 

[enuff_zed]

The tank number ending in 751 is listed as a Z4 part, the tank number ending in 781 is listed for the E46, E83 and E53 it also has a little flange at the top, don't know if that would make any difference though.
17117573781.jpg17117573751.jpg

Not really, as you just pop it off. It's only slid on.

 

[grannyknot]

The tank number ending in 751 is listed as a Z4 part, the tank number ending in 781 is listed for the E46, E83 and E53 it also has a little flange at the top, don't know if that would make any difference though.
17117573781.jpg17117573751.jpg

Not really, as you just pop it off. It's only slid on.

Gotcha

 

[patriot66]

The tank number ending in 751 is listed as a Z4 part, the tank number ending in 781 is listed for the E46, E83 and E53 it also has a little flange at the top, don't know if that would make any difference though.
17117573781.jpg17117573751.jpg

Not really, as you just pop it off. It's only slid on.

It has a diagram of the float level indicator min/max moulded on it. Not required on the E85 as it's moulded in the plastic radiator cowl panel next to the cap