Oil Lubrication vs Grease
TYPES OF LUBRICANT
Bearings can come pre-lubricated with one of two types of lube: oil or grease. There are pros and cons of each.
Oil - This is the most common type of lubricant and will generally be the fastest of the two. It will be fairly long lasting, but does tend to leak out of the seals. Beginners typically like oiled bearings best because they give the best hand spin, which can be satisfying and feel like your skateboard will be fast and have a smooth ride. But always remember that hand spin does not equate to speed because no weight is on the bearing!
Grease - Grease is the second most common type of lubricant and by far the longest lasting. Grease tends to stay inside of the bearing better than oil, which greatly increases it’s life. However, grease has more resistance than oil, so typically it has a slower hand spin than oil. But we know that doesn’t matter. Zealous in particular use a special nanoceramic grease meant to increase bearing life and speed.