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Ships within 48 hours · Estimated delivery Jul 22 - Jul 27
For Your Every Summer RSVP, with Code: SUMMER15
Description
Used 21066-3718 REGULATOR-VOLTAGE [K9211-20]Used 21066 3718 REGULATOR VOLTAGE [K9211 20] INCLUDED ITEM [NUMBER NAME] 21066 3718 REGULATOR VOLTAGE NOTE Used item, with some damages and stains but still usable.
![Used 21066-3718 REGULATOR-VOLTAGE [K9211-20]](https://cdn.shopify.com/s/files/1/0570/4089/6194/files/K9211-20_1.jpg?v=1771378751)
![Used 21066-3718 REGULATOR-VOLTAGE [K9211-20]](https://cdn.shopify.com/s/files/1/0570/4089/6194/files/K9211-20_5.jpg?v=1771378751)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 577 reviews
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Product Reviews
★★★★★ 1
garbage spark plugs
misfired after 30 minutes of driving cylinder 4 misfire code, left me stranded on the highway with baby in car. “(9621)” at the end of description is a lie, was not compatible with my vehicle even with compatibility test.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
★★★★★ 5
Fits 2011 335xi n55 prefect
Fits my 2011 335xi n55 engine perfectly. Comes on and off easily and gets the filter loose quickly. Amazing quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
★★★★★ 5
Works perfect for BMW S63 engine.
I used this to change the oil on my BMW M8 with the S63 engine. It was a perfect fit. It extended far enough onto the filter housing to be quite secure with no risk of slipping off and stripping the housing. It was snug on the housing and did not bind up due to having a loose fit. The tool feels well-built and I suspect it will outlive me given my occasional personal use. It would still probably hold up well even for daily shop use as long as it was not abused (repeatedly dropped, slammed around, etc).
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Reviewed in the United States on September 8, 2025
★★★★★ 5
Made well and great fit
Fits perfectly and is made well
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Make sure you know the size
Yes worked like a charm
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Reviewed in the United States on April 5, 2026
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