How Long Is A Britax Marathon Car Seat Good For
How Long Is A Britax Marathon Car Seat Good For . The service life for britax car seats manufactured after june 2010 varies depending on the model. As a convertible car seat, the britax marathon 70 has a lifespan of seven years. Britax Marathon ClickTight Convertible Car Seat for 190 from www.spoofee.com It means after 10 years from its manufacturing date; Britax seats expire 6 years from the date of manufacture, so a seat manufactured in 2004 is roughly half way to its expiration date in 2010. All britax car seats come with expiration dates displayed on the seat back or side.