Hi reddog
If you are using K & N filters which you should be as the Ducati OEM ones seem to leak
They have a nut formed into the body of the filter to instal and remove.
If you are using them get one of these. WURTH 0965 13 917 x 17 mm
From memory $18 ish.
They have a spiral sipe that gets more grip the more you torque it so if the nut on the filter has rounded off it still grips .
This is for removing only as you don't want to be over torquing the filter , I do hand tight so around 25 ft pounds 34 nm
I found filter removing hoops really hard to get positioned on the filter with it being recessed into the base of he motor.
The only way I could get out my original OEM filter was to drain the oil then belt a flat screwdriver through the filter
and twist it out as it was over tightened .
I use Silkolene full Synthetic but only cause my LBS stocks it but from what I have read Motul is the best.
Maybe throw some fresh sparkplugs in easy and cheap and amazing what a difference they make
sounds like your battery may be on its last legs get it load tested and when you get a service get a fresh fuel filter
