I got mine on EBay. Price was pretty reasonable (about $25.00)
A 2003 Shadow requires a gap of .031 - .035 in per owners manual
It is normally found in the glove box.
Honda manual recommends 10w-40 and the capacity is 3.3 US Quarts.
They should be in an owners manual available from MOTORLIT.COM
It will be in the owners manual. Get one from MOTORLIT.COM
The owners manual on a 2003 Honda Pilot (V6 engine) suggests replacing the timing belt at 105K miles as well as inspecting the water pump.
Normally it means change the oil/filter but it can mean other things. Your owners manual will tell you.
Here http://autousermanual.com/view/ford/taurus/2003/a/owners-manual/Here https://www.amazon.com/2003-Ford-Taurus-Owners-Manual/dp/B000SVQ25SHere http://www.ebay.com/itm/2003-Ford-Taurus-Owners-Manual-/262502343078?hash=item3d1e5be1a6:g:ywgAAOSwEjFXcup3&vxp=mtr
Use exactly the weight that is listed in your owners manual any major brand.
The 2003 Honda Insight has a 5-speed manual.
The 2003 Honda Accord has a 5-speed manual.
The 2003 Honda Civic has a 5-speed manual.