stiff gears when warm

[chris1975]

hi guys can anyone help ok i have a seat leon 2008 p2 1.9 tdi manual when cold the gears are fine but when warm the side to side movemet on the gear sick gose stiff i can get all the gears still but its hard to move the gear stick ive recently toped up the box oil maybe with the wrong stuff also heard the gear linkage can play up any ideas guys also whats the correct oill for the gear box thanks guys