Shell Nautilus Premium Outboard Oil is a high-performance lubricant for the protection of two-stroke gasoline outboard motors. Its advanced formulation, which exceeds all outboard motor manufacturer’s standards, is a guarantee of long and reliable engine life NMMA Certified TC-W3 5litreNMMA Certified TC-W3, NMMA License Number: RL-00444K 5011987075924 Says he gets more motors where the pots are Jet Black and burnt that have been using Nautilus, than any other oil type. Says only to use TCW-3 . ( Johnson OMC 140, around 1992, but only done 200 hrs.) Hmmm I use the Nautilus, and me piston tops are as clean as I have ever seen on a used motor. Nautilus is also TCW-3 as specified. Here are the results.. Shell Rotella T6 5w-40 28 hrs on oil (1 season) 198 hrs on engine aluminum 1 chromium 0 iron 5 copper 1 lead 0 tin 0 moly 69 nickel 0 manganese 1 silver 0 titanium 0 potassium 2 boron 50 silicon 12 sodium 4 calcium 822 magnesium 1064 phosphorus 1032 zinc 1199 barium 0 SUS viscosity @ 210* F 60.3 cST viscosity @ 100* C This Quicksilver 2-Stroke Premium Plus Marine Outboard Engine Oil, in a 4L jug, is designed to meet the rigorous demands of high horsepower outboards, including those with direct fuel-injected engines. It surpasses Mercury's in-house test standards, which are stricter than the industry's TC-W3 standard. This oil burns cleanly, reducing carbon Ya i checked the label today at the store, the shell oil is ashless. I did see some Castrol snowmobile oil there that is low ash and has a API-tc rating for $20 a gallon/4L. I ran IPONE synthetic last year but its more than double the price. FC-W™ lubricants have demonstrated the necessary performance and quality needed need in today's high performance four-stroke engines. The next time you are purchasing four-stroke oil for your marine engine, look for the FC-W™ trademark. 2006 FC-W CERTIFIED OILS FB-30011B AMSOIL FORMULA 4-STROKE MARINE, SYNTHETIC 10W30 MOTOR OIL AMSOIL INC. CQYNuvO.

shell nautilus premium outboard oil review