Look in your owners manual but usually 5w-30.
If you have the regular cobalt you need to use 87 octane gas and if it is the ss with the supercharged engine you use high test.
It should have a 2.2L L4 engine.
bosch
its a closed for life transmition
There are a variety of options for one to purchase accessories for a Chevy Cobalt. One of the best options is the Everything Cobalt site which offers just about any kind of accessory available for the Cobalt. Other options for accessories are Auto Anything and Auto Parts Warehouse.
ac delco pf457 filter
Edmunds gave the 2007 Chevy Cobalt Coupe LS decent reviews. They did complain about the car because of how the engine works, but it is fairly a good car.
Talk to your parts/service guy at your local dealership, coolant can be specific to year of production. Typically Dex-Cool or Chrysler Green will do just fine and is what the dealerships use
Dex-Cool
CH9018...It's a really small filter, doesn't even come in a canister like a lot of filters do.
4L60E / 4L65E transmission.
Use any major brand 5W20 oil.