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I change mine every 3000 no matter what-use Penzoil High Mileage and a Fram XG Filter everytime. Been doing that for 110,000 miles and have had to do nothing but changes the tires.
Synthetic 5W-20 every ~6k (10k km's)
During the motor rebuild there was no sludge whatsoever. Crumpled a Fram filter like a pop can, I use moto-master filters now