Identify your use-case: baking (aim for neutral crumb) or frying/roasting (aim for stable, higher-heat behavior).
Choose the closest match from the ingredient list: canola, sunflower, or refined vegetable oil for most recipes.
Swap using the listed ratio (typically 1:1). For baking, also mix wet ingredients until fully emulsified to prevent dryness.
If your substitute has any extra flavor (like mild olive), keep add-ins consistent (vanilla/cocoa/seasonings) to avoid taste shifts.
For higher-heat cooking, preheat properly and avoid smoking; if the oil smokes early, reduce temperature next time.