Originally Posted by
harbor
From 2005 through 2018 I had two XFires with manual trannys, a 2005 replaced by a 2007. During that time period I tried numerous fluids to improve shifting including M1 motor oil, ATF, Amsoil trans fluid, etc. All worked initially, but soon the 1st to 2nd gear crunch returned along with tough cold shifts. Finally I tried the MB factory fluid from NeedWings and the shifting issues were resolved permanently. Since this is the identical fluid that MB put in the comparable SLK320, it stands to reason it would work in the XFire tranny. Their are a ton of posts on this topic, and below is one of many.
https://www.crossfireforum.org/forum...-question.html
just confused everyone says different so is that gear oil or engine oil i dont have any gear change issues but when driving slow in first and second leave off throttle i can hear a faint noise