Based on the reviews, the Birch Moisture Sun Cream by ROUNDLAB is highly recommended for oily skin due to its lightweight and non-greasy formula. Users have praised its ability to absorb smoothly without leaving a heavy or oily residue, making it suitable for daily use even under makeup. However, some users with oily skin mentioned that it can feel a bit too rich and cause excess shine to build up throughout the day. It's advisable to apply it in thin layers to avoid this issue.