RE: fatboy oil change and checking level??
I had 3 Yamaha's before my Harley. An XS 750 triple, XS 1200 and V-Max ... If you check the oil level in the oil tank the same way each time you're done. Example I always check mine engine cold on side stand. The oil level comes to the bottom stripe of the dipstick. Had the bike 3 years, 13,000 miles, no problem. I have the dealer do all maintenance. Using the syn3 means changing engine oil every 5k. Your dealer should publish their flat rates to change the oil. A 5, 10 or 15K service should run around $200 bucks.
2003 Heritage Classic
95" Stage II HTCC
Six Speed SE Tranny
Heated Grips/Tour Pak