Editorial Review Mercury Marine 15/20 hp 4-Stroke Oil Change KitMercury oil change kits contain industry-leading Mercury 25W-40 Marine Engine Oil. Over five years of engineering and development went into the exclusive Flagship Protection formula which features a high-tech, advanced set of anti-wear additives that provide up to 35% better camshaft wear protection and the highest levels of corrosion and oxidation protection. Designed to maintain engine reliability and performance, Mercury 25W-40 Marine Engine Oil has been proven to hold its viscosity ratings longer in industry wear testing than other oils on the market. Mercury Oil, combined with a genuine Mercury Oil Filter team up to provide the #1 protection on the water.Industry Leading Strength - Mercury provides the longest lasting, strongest protection.Flagship Corrosion Resistance - New advanced corrosion inhibitors outperform competition and all industry standards. Provides protection against rust and corrosion in wet environments and during off-season storageUltimate Wear Protection - Using new, high-tech additive technology, Mercury has 33% greater camshaft wear protection compared to other marine dealers.Each kit contains all the items needed to change oil in select Mercury 4-Stroke Outboards: (1) 25W-40 Marine Engine Oil (1) Oil Filter - 822626K03 (1) Drain Plug Seal - 895146 Complete instructions printed right on the boxChange engine oil and replace oil filter every 100 hours of use, or annually (whichever comes first). InstructionsMercury Oil Change Instructions for 4-Stroke 15/20 CarbOil Change Procedure Lock the outboard in the full tilt-up position Position outboard so the drain hole is facing downward. Remove drain plug with a 5/8" or 16mm wrenchand drain engine oil into an appropriate container. Note: Do Not use a crankcase oil pump when changing oil or damage may occur. After the initial oil has been drained, temporarily reinstall the drain plug. Disengage the tilt lock and lower the outboard.