Hi on our recently bought 105,000 miler the 6 speed gear change can be notchy or stiff especially when cold.
Any tips on improving this, on Porsche 911's they recommend using SWEPCO, your thoughts would be appreciated.

 

Its normal for the auto transmission to not want to shift when its cold. The following quote is from the owners manual,
"upshifting from 1st to 2nd to 3rd gear is delayed depending on vehicle speed and engine temperature. This allows the catalytic converter to heat up more quickly to operating temperatures.
During the brief warm-up period this delayed upshift and increased engine noise might be perceived as a malfunction. However, neither the engine nor transmission are negatively affected by this mode of operation."