If you own a small pleasure craft, you may only use the vessel in the summer. For the rest of the year, the boat may be kept in storage. Last spring when I took my boat out of storage, I noticed that the engine wasn't working as it should be. It sounded very rough and did not provide enough power when I launched my boat on the water. I took the boat to an engine repair shop and they gave the engine a service. They explained that the old oil which was in the engine was the cause of the problem and then gave me some great motor engine maintenance tips.