Install a new o-ring for a proper seal. 20x3
2X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat! Seals the coolant return pipe for AWM engine code only
Prevent overheating and premature engine wear
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply Up to VIN 8D-X-315000, split is in the 1999 model year
Brand:
ES#:
2894961
Mfg#:
078121113F
Ships in 2 Business Days
$29.99
This product was last offered at the strikethrough price on 05-07-2026
Located on the left side of the engine block
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
2804447
Mfg#:
06B121121L
In Stock
ON SALE!
SAVE 15%
$9.99
This product was last offered at the strikethrough price on 09-16-2026
Prevent overheating and premature engine wear. Includes O-ring
2X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply We Price Match - Give Us A Call or Chat!
Maintain proper operating temperature with a new thermostat, housing and hardware
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
2581867
Mfg#:
050121113CKT-3
Ships in 3 Business Days
ON SALE!
SAVE 13%
$44.99
This product was last offered at the strikethrough price on 05-02-2026
Maintain proper operating temperature with a new thermostat, housing and hardware
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
2581864
Mfg#:
050121113CKT-2
In Stock
$83.99
This product was last offered at the strikethrough price on 10-01-2026
Ensure a proper seal when installing your new thermostat
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Ensure a proper seal when installing your new thermostat. 50x4
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Includes sealing O-Ring
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply From VIN 8D-X-315001, split is in the 1999 model year
Brand:
ES#:
2894962
Mfg#:
078121113G
Ships in 2 Business Days
$18.99
This product was last offered at the strikethrough price on 07-02-2026
Includes sealing O-Ring
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply From VIN 8D-X-315001, split is in the 1999 model year
Prevent overheating and premature engine wear with a lower opening temperature
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Located on the water pump assembly
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
272857
Mfg#:
030121121B
Ships in 4 Business Days
15% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$40.99
This product was last offered at the strikethrough price on 08-31-2026
Does not include sealing O-Ring
Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply Lower temperature thermostat, stock is 87°C
Maintain proper operating temperature with a new thermostat, housing and hardware
10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Brand:
ES#:
2581870
Mfg#:
050121113CKT-4
In Stock
ON SALE!
SAVE 28%
$41.99
This product was last offered at the strikethrough price on 05-02-2026
Your thermostat helps regulate engine temperatures by allowing the coolant to circulate through the radiator once it opens. If it fails, this might mean it never closes, but worst case, it could mean your coolant doesn't get to the radiator. Stay ahead of cooling issues by replacing your thermostat regularly with an OEM thermostat or quality aftermarket thermostat from our selection.
Lifetime Replacement
