Pat is right.
according to the manual:
1.6lt (105bhp), 1.6lt(120bhp), 2.0lt :
Engine Oil (with filter change): 4.4 lt
Gearbox/differential oil: 2.01 lt
About the brand, you can use whatever 10W40 oil you like, as long as you keep checking it after their first 3.000 kms. By checking i mean to put one-two drops (using the level meter) in your fingers and make sure it keeps feeling like thick oil and not like black water, maintaining its lubrication capability. i wouldnt trust Helix more than 7.000kms though, but thats just my personal (and amateur) opinion.