![]() Outboards are cooled using raw water, which is often cool to very cold. Doing so may result in aeration of the oil, reducing lubricity and oil pressure, and may cause eventual engine damage. Therefore, add oil slowly and in small amounts, and do not attempt to “top off.” Do not allow the oil level to surpass the upper portion of the crosshatch pattern. Yamaha 4-stroke outboards have a tapered oil sump design (smaller at the top than the bottom), so the closer the oil level is to full, the faster it fills. Tip: The top and bottom of the crosshatch pattern on the dipstick do not represent “high” and “low.” The correct oil level indication is at the mid-point of the pattern. At the proper oil level, the oil should be halfway up crosshatch pattern on the dipstick.This helps ensure proper venting for accurate indication. Then pull the stick again and check the oil level. Pull the dipstick, wipe the oil from it and re-insert it in the crankcase.You can place a small level on top of the anti-ventilation plate to help you determine when to stop. Tilt engine up halfway and allow to rest for 5 minutes to thoroughly drain the oil back into your outboard’s crankcase.Start and warm the outboard to normal operating temperature, then shut it off.It’s easy to get an accurate reading if you follow this procedure: ![]() ![]() The oil level check procedure for your Yamaha 4-stroke outboard is a bit different than the procedure for your car. ![]()
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