Terios Diff Lock. As the new proud owner of a Terios I am seeking information on using the Diff Lock. The Manual is very brief in describing its use. When and how can it be used ?, is there a Max speed when using it ?, Can it be used in normal use i.e on a Muddy Track etc. Has anyone used a Terios Off Road, if so how did it perform. I have owned a Four Trak and Nissan Terrano in the past and found them both great off road, however i'm just wondering what a Terios can do, If anything.