Rein BMW Coolant Expansion Tanks for BMW 7 Series E66 (2002-2008)

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On certain models, namely E36, E46, and E90, the factory BMW expansion tank is prone to either breaking at connection points or blowing apart altogether. If you're starting to feel like your expansion tank is on borrowed time, it's probably time to replace with either a direct OE replacement, or strengthen your cooling setup with an aluminum expansion tank - we offer numerous performance upgrades for your expansion tank. Especially if you're someone who likes to track your BMW, we recommend upgrading your expansion tank to avoid ruining your track day.
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Rein Expansion Tank Cap - 17111742231 - E30, E36, E46, E34, E39, F10 5 Series, F06 6 Series, E32, E38, E65 E66 F01 F02 7 Series, E31, E83, E53, E52
Rein Expansion Tank Cap - 17111742231 - E30, E36, E46, E34, E39, F10 ...
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T#:340541
Part#: 17111742231
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$ 17.99

This product was last offered at the strikethrough price on
10-22-2026

$ 13.69 USD
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$ 13.69 USD
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This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.
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Rein N62 N73 Coolant Expansion Tank - 17137647713 - E65 7 Series, E66 745Li 750Li 760Li
Rein N62 N73 Coolant Expansion Tank - 17137647713 - E65 7 Series, E66...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:593077
Part#: 17137647713
Ships in 4 Business Days
$ 99.99 USD
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$ 99.99 USD
Free Shipping
Add to Wish List
Rein Coolant Expansion Tank for the E65 and E66 on N62 and N73 engines, an OE-equivalent replacement for cracked or faded tanks. Look for cracking, broken nipples, or damaged mounting points, which let coolant escape from the cooling system. Replacing the tank keeps the coolant where it belongs as fluid expands and contracts with temperature changes.
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