Hello all, Here's my story briefly. I just bought like today.... a spanky new, zero mileage 2009 SYM Citicom 300i from a motorcycle shop that closed it doors via an auction. Ok, no user manual comes with when I went to pick it up. So I am full of questions. Like what octane gas to use. Transmission oil and Engine oil do you recommend. I was able to download the user and service manuals online. I want this scooter for my work commute which is over an hour away, so this little thing better be reliable... I am a woman, motorcyclist...own a Yamaha bagger which is great for long runs. A puddle jumper just looked like fun and I hope I get great gas mileage. Is gear oil the same as transmission oil? I am thinking so. Where do you recommend for getting replacement parts. I would like to run synthetic in it, but I need the weights. There are no scooter mechanics in my neck of the woods, so a lot of this I will be doing for myself. Does this bike have issues I need to look out for? Also are there SYM tool kits to purchase to put in your bike? Thanks in advance. I am used to riding 964 lb bike, this thing is quite wobbly and high. Sort of freaky. Also no shifter... You just use your brakes all the time to slow down? You must go thru a lot of brake pads. Assure me I will not die on this thing....BTW, what average sweet zone this bike likes to go at? Top end is 79 mph? Thanks...WR 
Hi - good choice of scooter and you lucked out with zero miles :-) I've had no problems with mine. After 43,000kms one fork seal needs replacing but this is just servicing really, so if you look after yours, it should be trouble free. I put the scoot on my blog so there's lots of info there
https://myl8test.wordpress.com/mbikes/sym-citycom-300i/You already downloaded a service manual
https://myl8test.files.wordpress.com/2015/03/city-com-service-manual.pdfHere are parts lists pdfs, not that you'll need them
http://www.symcanada.com/techPages/techCityCom.htmlI use 95 unleaded.
I use cheap 10W40 API SL engine oil - change when the red oil light comes on. It's quite frequent so don't waste $$ on premium oil that is designed to last a long time. (BTW the oil light is not a warning light as such - a reminder light - reset it with a button press on the dash.)
I change the gearbox oil using a jumbo syringe every second engine oil change - I use Castrol GL5 85W-140.
Air filters clog up rapidly and aren't cheap so a few owners have made their own from a discarded old one. It's easier than you imagine and worth it if you're looking to keep running costs low for long term use/ownership. If you can get a 5cm x 20cm K&N element, this will flow about the same as the original larger paper element. Epoxy putty is a decent seal and solid fixing to hold the K&N filter onto the SYM filter frame.
My brake pads have lasted well but I commute on a highway so YMMV. I found cheap replacements on Ebay - details in the blog.
Your tires might be very old Maxxis - any cracks? Most people love Michelin City Grips but I can't get them here in HK so I have Seyoun NJK - quite similar to the original Maxxis.
No idea about sourcing parts or tool kits for you there, sorry.
The front bodywork is a major pain to remove until you've had some practice, so even a bulb change can take half a day at first. The headlight system is funky so stick to standard bulbs - it won't work with LEDs as standard.
Coming from a motorcycle, the handling will be a little odd at first but I got used to it pretty quickly. The front brake is crap because of a tail heavy weight distribution and the pads are crap - EBC do a sintered metal pad upgrade SFA264HH that fixes that. Keep the OEM front pads - they are identical to the ones in the rear where they work well. Again, details on the blog :-)
The first place to rust will probably be the rear shock springs and then the starter motor, located immediately in front of the rear wheel. I removed the rust and painted it with Hammerite.
Not much else to know - just do the usual checks and servicing and it'll last. You can keep the unpainted plastics looking fresh with Amor All Protectant or similar. :-)