The plugs in the differential can wear over time. Sometimes they end up cross-threaded; other times the fittings end up rounded off. We recommend inspecting both the fill and drain plugs every time you change your differential oil. See Related Items below for the sealing washer and the fill plug. Sold individually; one required per car.
Nissan 350Z, 370Z
Nissan Z33, Z34
2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
We always suggest removing the fill plug before removing the drain plug. This will ensure that you do not end up with an empty differential that you can't refill.