Skoda octavia scout 4x4 engine light

Hi all, just a quicky, engine light on, cylinder 1 is the issue, put new plug in, swapped coil packs but still cylinder 1 issue, not sure what to do next, petrol engine 170,000 miles,burns alot of oil, dipstick drips black as yr boot when checking it lol, had it a year, just wondering if theres any advice or whether im flogging a dead horse at this stage, any thoughts greatly appreciated