I understand you're looking for a PDF of the owner's manual for the (also known in some markets as the Hyundai XG or XG300/XG350 ).
: Engine data (usually the 1.5L Alpha engine for Avega), dimensions, tire sizes, and lubricant capacities. Dezo's Manuals OWNER'S MANUAL - Hyundai Motor Company manual book hyundai avega pdf
Hyundai Avega (also known as the Hyundai Accent in many markets, specifically the generation sold between roughly 2006 and 2012) is a popular sedan and hatchback. While finding a digital version specifically branded "Avega" can be tricky because it was often a regional name, the manual for the Hyundai Accent (MC) Hyundai Avega I understand you're looking for a
Unlike newer Hyundai models that are hosted directly on the Hyundai global website, the Avega (which was discontinued in many markets around 2017) requires a bit more digging. Note: Older models (pre-2010) may not be available