Classic Saab 9-5 (1997 - 2009)
My 9-5 aero has a tendency to twitch and tramline, when it is cold. This alsmost entirely disappears when it has run for 10-20 miles. It feels like the rear end, but I'm not sure what the cause is.
Some background: it has 94W tyres which have done about 15k and are down to about 4.5mm tread and...