Yar if you keep on using your Civic 2005 on petrol, then prosmatic is also fine, but if you plan to install CNG on it, then I wouldn't recommend that at all as Prosmatic is failed on CNG and my civic is giving me around even 15-16 km/l on petrol as I follow HYPER-MILING technique which you can find on pakwheels forum, but again Prosmatic is a problem as you can't follow Hyper-Miling well on Prosmatic, though by following that it will give you a good milage, but not as good as Manual one. Moreover, use Havoline Formula Engine oil (but make sure it's the original one with trademark) as I use it and pretty satisfied with it. About visual treats, I would say anything after seeing the pics of your car. Cheers.