Five years from now, Ducs will no longer be in fashion.
Note (OP): They want you to change the plugs at 11 KM's to ensure the seal between the plugs and the cylinder head is broken. Plugs that are left in too long will eventually weld themselves to the cyl head.
"Five years from now, Ducs will no longer be in fashion"
You're not serious I hope when you typed that? Aesthetics aside even for those that don't appreciate Ducati's unique frame styling (no one else does a truss frame worthy of mention in my opinion) there isn't another sporting big twin that runs quite like a Ducati does. Ride one and go up and down through the gears and you (might) see what I mean. They give whole new meaning to valve actuation control, albeit a bit labour-intensive to adjust, but the engine (and chassis FTM) has a character that is not easily duplicated.
However, if, when shopping for a car and you could afford an upscale model, but question the expense over...say.. a Civic, and test drive them both but you happen to not be able to feel the difference in the driving dynamics between a 3 series BMW and the Honda, and rate them both basic A to B modes of transportation, then you definitely won't get the example I suggested above.
"Plugs that are left in too long will eventually weld themselves to the cyl head."
I have wondered this also, but there seems to be many misconceptions out there depending on who you ask. But if they merely wanted the seal broken, why not instruct owners to loosen and re-torque the same plugs?
Here is an excerpt I copied off the net a while back that others I have asked since have backed up, and is good advice. The most common reason people have 'seized' plugs is if they try to remove a hot plug. Reason explained below.
<Here are a couple of tips to help assure the success of changing spark plugs. The first is to remove spark plugs from aluminum cylinder heads only when the engine is cool. Since aluminum and steel expand and contract at different rates, removing spark plugs from an aluminum cylinder head while hot can actually cause thread and cylinder head damage. Before installing the spark plugs, make sure the threads are clean and in good condition. If in doubt, run a thread chaser through the plug opening in the cylinder head. Champion recommends that you do not use an anti-seize compound, since one has already been applied to the plugs at the factory. Next, install the spark plugs finger tight and, it using a taper seat spark plug, use a ratchet to rotate 1/16 of a turn. If using a gasket seat type spark plug, after installing finger tight, turn 1/4 to 5/8 of a turn. If this procedure is followed, spark plugs will not back out nor will they seize in the cylinder head.>