sludge in oil

[bibik]

to prevent sludge the bike must be regulary driven long enough to reach normal operating temperature.My question is this:Is stop and go driving in town bad for this?I think when an aircooled motor idling it heats very well also.Can traffic riding building sludge when it is long enough?

[Bob Broussard]

With the modern oils I don't think sludge is an issue. I think sludge buildup is mostly in cars that go way too long between oil changes.
Just use a Quality oil and you'll be fine.
I like Motul full Synthetic myself.
I'm going to use Redline synthetic in my new motor. Not sure if you get that in Greece :dunno:
Motul is easy to find over there.