Use the exact weight that is listed on the oil fill cap which is more than likely SAE 5w20. You can use conventional or synthetic, which is your choice. Also use a quality oil filter such as Purolator, Bosch, Wix, or Honda filter.
Put your seat belt on
Buy a new power port or replace fuse
08 - 09 1.8 quarts
im pretty sure its the k20z3 motor in the new civic si's (09 civic si.) that's stock now i don't know modded it all depends. I'd rather have the k20 type s out of the 05 rsx type s(that's just my opinion). but money wise. you can buy and build a nice GSR(b18c1) for the price of a STOCK k20. Unless money is no option, and you can afford it.
Civic Commons was created in 2010-09.
on an 09 civc si there are 5 lugs
Croatian Civic Party was created on 2009-09-25.
Civic Solidarity Party was created on 1992-09-26.
Honda Tadamasa died on 1631-09-06.
From any Honda dealer.
The Injen cold air intake will work if you drive through a puddle as long as you don't let off the gas.