Want to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional oil analysis kits. Results are typically received in a few days via email. Shop now.Mercury 100 Hour Service Kit 75-115HP 2.1L 8M0097854. The Mercury 75-115HP 2.1L 100 Hour Service Maintenance Kit - 8M0097854 includes the essential components required to perform the recommended 100-hour maintenance on Mercury 75 HP, 90 HP, and 115 HP 2.1L FourStroke outboards with serial numbers 2B094996 and above. This convenient kit includes Mercury 25W-40 marine engine oil along with the required filters, gear lube, and seals needed to complete routine maintenance.. Performing scheduled 100-hour service helps maintain proper lubrication, protects internal engine components, and ensures reliable operation. By bundling the key maintenance component