Viscosity. In terms of viscosity, the 10w40 motor oil means it has ten as weight and forty as a viscosity grade. In the 20w50, it means twenty for weight and fifty for viscosity grade. So for a twenty viscosity grade, it means that at one hundred degrees celsius, it will be half as thick as zero degrees celsius. Jul 22, 2007. #1. Kohler recommends this oil for the command pro engine in my lawn mower. I can buy it locally for $2.69 at Tractor Supply. I wonder who bottles this for Kohler. Here are the specs for this oil. Command 10W-30 This multi-viscosity oil pumps easily to provide instant lubrication to overhead valve components during start-up. Since Plus-50™ II is a multi-viscosity oil, it is not recommended as it doesn’t meet both requirements noted (less than 1% ash and single viscosity). Q. I use Torq-Gard SAE 10W oil in the winter and Torq-Gard SAE 30 in the summer. Can I use Plus-50 II 15W-40 oil year-round instead of changing oil grades seasonally? A. I understand cold flow differences make the 0w flow better than 5w at a certain ultra cold temp, something like -35 degrees below 0. Likewise, 5w flows better than 10w at something like -30. Let's say you're living in warmer states in the CONUS, where temps never get below -20 (and rarely get that low). The 10w30 motor oil is thinner than the 15w40 motor oil. As a result, its film strength is weaker. It can also be more prone to oxidation. You will need high-quality additives to compensate for the 10w30 motor oil. However, a 10w30 motor oil will perform better than the industry standard of 15w40 motor oil. Signature Series 5W-30 is a versatile oil aimed at mixed fleets of diesel and gasoline vehicles, simplifying maintenance and lubricant inventory. Its extended-drain capability further maximizes convenience and minimizes downtime for fleet managers with busy schedules. It is also an outstanding option for newer over-the-road trucks that come yU4vE.

difference between 10w and 15w oil