Engine oil change on a 2008 Harley Davidson Road Glide. The basic principle is the same with all bikes but the position of the oil tank, the oil filter and the drain plug differs on different makes and models. Also make sure you buy the right engine oil and oil filter for your make and model. Don’t mess with the quantities, too much oil is just as bad as too little and it can ruin your engine. Always perform a short test ride, check the oil level and also check for any leaks.