Car Engine Parts Online

From air filters to fuel delivery, online engine parts are essential for automotive repairs, maintenance, and even performance upgrades. Whether you’re an experienced mechanic or automotive enthusiast working on your daily driver or restoring a classic, Sixity Auto has you covered. Dive into our catalog below to find the car engine parts you need to keep your vehicle running smoothly.

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  1. Rein Engine Oil Separator
    Rein ABH0219 Oil Separator
    Special Price $66.95 Regular Price $95.99
    Out of stock
  2. Rein Engine Oil Separator
    Rein Oil Separator for 2006-2008 Audi A6 Quattro 3.2L V6
    Special Price $139.95 Regular Price $199.99
    Out of stock
  3. Rein Engine Oil Separator
    Rein Upper Oil Separator for 2011-2012 Audi Q5 2.0L L4
    Special Price $82.63 Regular Price $117.99
    Out of stock
  4. GMB Fuel Tank Lock Ring
    GMB Fuel Tank Lock Ring for 1998-2003 GMC Yukon 4.8L 5.3L 5.7L 6.0L V8
    Special Price $28.89 Regular Price $40.99
  5. GMB Fuel Tank Lock Ring
    GMB Fuel Tank Lock Ring for 2003 Hummer H2 6.0L V8
    Special Price $28.89 Regular Price $40.99
  6. Carter Fuel Tank Lock Ring
    Carter Fuel Tank Lock Ring for 1998-2005 GMC Jimmy 4.3L V6
    Special Price $53.53 Regular Price $75.99
  7. Delphi Sparta Fuel Tank Lock Ring
    Delphi Sparta Fuel Tank Lock Ring for 1995-1998 Buick Riviera 3.8L V6
    Special Price $14.87 Regular Price $20.99
  8. Delphi Sparta Fuel Tank Lock Ring
    Delphi Sparta Fuel Tank Lock Ring for 2002-2004 Oldsmobile Silhouette 3.4L V6
    Special Price $14.87 Regular Price $20.99
  9. Delphi Fuel Tank Lock Ring
    Delphi Fuel Tank Lock Ring for 2002-2005 Buick Rendezvous 3.4L V6
    Special Price $15.19 Regular Price $21.99
  10. Delphi Fuel Tank Lock Ring
    Delphi Fuel Tank Lock Ring for 1997-2005 Buick Park Avenue 3.8L V6
    Special Price $15.19 Regular Price $21.99
  11. Delphi Fuel Tank Lock Ring
    Delphi Fuel Tank Lock Ring for 2007-2009 Suzuki XL-7 3.2L 3.6L V6
    Special Price $15.19 Regular Price $21.99
  12. Delphi Fuel Tank Lock Ring
    Delphi Fuel Tank Lock Ring for 2000-2005 Buick LeSabre 3.8L V6
    Special Price $15.50 Regular Price $21.99
  13. Carter Fuel Tank Lock Ring
    Carter Fuel Tank Lock Ring for 1997-2003 Ford F-150 4.2L 4.6L 5.4L V6 V8
    Special Price $20.58 Regular Price $28.99
  14. Carter Fuel Tank Lock Ring
    Carter Fuel Tank Lock Ring for 1983-1984 Chevrolet Chevette 1.8L L4
    Special Price $21.12 Regular Price $29.99
  15. Carter Fuel Tank Lock Ring
    Carter Fuel Tank Lock Ring for 2004 Chevrolet Silverado 2500 6.0L V8
    Special Price $23.22 Regular Price $32.99
  16. Carter Fuel Tank Lock Ring
    Carter Fuel Tank Lock Ring for 2004-2006 GMC Sierra 3500 6.0L 8.1L V8
    Special Price $23.22 Regular Price $32.99
    Out of stock
  17. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2006-2011 Chevrolet HHR
    Special Price $26.84 Regular Price $37.99
  18. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2017 Chevrolet Silverado 2500
    Special Price $26.84 Regular Price $37.99
  19. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2013 GMC Yukon XL 2500
    Special Price $26.84 Regular Price $37.99
  20. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2014 Chevrolet Suburban 1500
    Special Price $26.84 Regular Price $37.99
  21. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2005-2010 Pontiac G6
    Special Price $26.84 Regular Price $37.99
  22. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2006-2017 Chevrolet Impala
    Special Price $26.84 Regular Price $37.99
  23. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2017 Chevrolet Silverado 2500 HD
    Special Price $26.84 Regular Price $37.99
  24. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2016 Chevrolet Silverado 3500
    Special Price $26.84 Regular Price $37.99
  25. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2015-2017 GMC Yukon XL
    Special Price $26.84 Regular Price $37.99
  26. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2007-2017 Chevrolet Cheyenne
    Special Price $27.39 Regular Price $38.99
  27. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2014 GMC Yukon XL 1500
    Special Price $27.39 Regular Price $38.99
  28. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2006-2011 Buick Lucerne
    Special Price $27.39 Regular Price $38.99
  29. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2005-2016 Buick LaCrosse
    Special Price $27.39 Regular Price $38.99
  30. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2008-2017 Cadillac CTS
    Special Price $27.39 Regular Price $38.99
  31. Dorman Fuel Tank Lock Ring
    Dorman Fuel Tank Lock Ring for 2004-2017 GMC Yukon
    Special Price $27.39 Regular Price $38.99
  32. GMB Fuel Tank Lock Ring
    GMB Fuel Tank Lock Ring for 2002-2003 Cadillac Escalade 5.3L 6.0L V8
    Special Price $28.89 Regular Price $40.99
  33. GMB Fuel Tank Lock Ring
    GMB Fuel Tank Lock Ring for 2000-2003 Chevrolet Suburban 2500 6.0L 8.1L V8
    Special Price $28.89 Regular Price $40.99
  34. GMB Fuel Tank Lock Ring
    GMB Fuel Tank Lock Ring for 2000-2003 Chevrolet Tahoe 4.8L 5.3L V8
    Special Price $29.48 Regular Price $41.99
  35. GMB Fuel Tank Lock Ring
    GMB Fuel Tank Lock Ring for 2000-2003 Chevrolet Suburban 1500 5.3L 5.7L V8
    Special Price $29.48 Regular Price $41.99
  36. Carter Fuel Tank Lock Ring
    Carter Fuel Tank Lock Ring for 2001-2003 Chevrolet Silverado 3500 6.0L 8.1L V8
    Special Price $53.53 Regular Price $75.99
  37. Rein Engine Oil Separator
    Rein ABH0261 Oil Separator
    Special Price $119.33 Regular Price $169.99
  38. Rein Engine Oil Separator
    Rein Oil Separator for 2010-2012 Audi S4 3.0L V6
    Special Price $135.85 Regular Price $193.99
  39. Rein Engine Oil Separator
    Rein Oil Separator for 2012 Audi A6 Quattro 3.0L V6
    Special Price $141.02 Regular Price $200.99
  40. Delphi Sparta Fuel Tank Lock Ring
    Delphi Sparta PN9003 Fuel Tank Lock Ring
    Special Price $5.81 Regular Price $7.99
  41. Carter Fuel Tank Lock Ring
    Carter TLR12 Fuel Tank Lock Ring
    Special Price $6.01 Regular Price $8.99
    Out of stock
  42. Delphi Fuel Tank Lock Ring
    Delphi FA10023 Fuel Tank Lock Ring
    Special Price $6.11 Regular Price $8.99
  43. Airtex Fuel Tank Lock Ring
    Airtex LR3003 Fuel Tank Lock Ring
    Special Price $8.66 Regular Price $11.99
    Out of stock
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High-Quality Engine Parts for Your Motor Vehicle

Sixity Auto works with top brands to build our inventory of OEM-quality engine parts online, ensuring you have access to reliable and cost-effective components. We promise that every part fits as advertised and meets or exceeds expectations. 

We want to make sure that whether you’re performing routine maintenance or making a major repair, you can find the best parts at a fair price. Our focus is always on delivering affordable solutions without compromising the strict tolerances for your vehicle’s longevity. 

Fast, Reliable Shipping

We know that when you order car engine parts, you need them right away. Our network of US warehouses enables us to offer fast, dependable shipping across the US, with 99% of orders shipping within one business day. Many of the items in our catalog also come with free shipping. 

A Reputation You Can Count On

Sixity Auto has been in business for over 20 years and has shipped over 10 million engine parts from our online storefront. Our customers praise our products and timely delivery. If you have any questions about us or our inventory, contact our US-based customer service department. We’re happy to be of service.

Frequently Asked Questions

How fast will your engine parts arrive?

Timing is a top priority. We use our extensive network of warehouses to ensure speedy delivery, with most orders shipping within one business day. That said, the exact delivery time will depend on the parts ordered, your location, and the delivery options selected during checkout.

Are the parts on Sixity Auto comparable to what I’d find in a store?

Absolutely! We stock only top-quality OEM-replacement auto parts that meet or exceed original equipment specifications. The crucial difference between Sixity Auto and the other guys is price. We offer these high-quality parts at prices typically lower than those at your local auto parts store.

Do you offer any discounts for the engine parts sold online?

Yes. We’re proud to offer a 10% discount on everything for military personnel


© 2026 Sixity, Inc. Part of Proximity Group, an American-owned and operated online retailer. All Rights Reserved.