So, what is the difference between 15W-50 vs. 10W-40 engine oils? A 15W-50 is a thicker oil better suited for high-performance engines in hotter climates. I read an interesting post regarding the use of straight SAE 40 vs 15W40 in 4 stroke engines. Apparently, the use of straight 40 provides better lubrication and wear protection. The only down side would probably be the thickness in the winter time. How ever, in 2 stroke Detroits, such as at the 8v71 (aka 318 Detroit) and 6V92T they specify SAE 40. Shell Rotella T5: The Rotella T5 that comes in two viscosity grades 10W-30 and 15W-40 is a synthetic blend of heavy-duty engine oil that uses a combination of synthetic base oils and state-of-the-art additives. It can withstand extreme weather conditions especially in winter and help protect your engine. In comparison to a 15w40 motor oil, a 10w40 oil is believed to degrade more quickly. This is because the viscosity indexes of 10w40 motor oil are higher. However, this statement is regarded to be false. This is the bane of today’s engines, as it drastically shortens their lifespans. Some sludges will also be present. In the case of lawn mowers, two-stroke engine oil is mixed with the gasoline before it goes into the tank. Mixing ratios of gas to oil vary, but usually range from 30:1 (4-1/4-oz. of oil to one gal. of gas) to 50:1 (2-1/2-oz. of oil to one gal. of gas). The owner’s manual for your lawn mower lists the mixing ratio of gas to oil. 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. Basically our 5W-30 and 10W-30 are the lower HTHS equivalent of your 10W-40 and 15W-40 Oils. 10W-40 got a bad name in the USA in the early days when it was produced with Group I Base Stock and shear prone VII and tended to have sludge formation issues. Many USA Owner's Manuals specifically forbid the use of 10W-40 for this reason. If you started w/ 10w-30 and went to 15w-40, that could make a difference. Also check the oil level on level ground. if they happened to over-fill it, that could also make a difference if the crankshaft throws are beating into the oil because the level is too high. That also aerates the oil and makes it less effective as a lubricant, so However, in warm places, you won’t see any difference. Since both oils have the same viscosity grade at higher temperatures, they will perform the same. But between both oils, the 0W-40 is superior. Choosing the Best Oil For You: 0W-40 or 10W-40. We’re going to say it again, use the oil that is recommended in your car manual. The main difference between 10W-40 oil and 15W-40 oil is that 15W-40 oil has a higher viscosity than 10W-40 oil. 10W-40 oil allows the engine to run freely. Below you can find a equivalence suspension oil chart (both for motorcycle and bicycle) where you can easily choose the closest oil to the original one. Oils are sorted by Viscosity. SAE range is only shown for your reference. If you can’t find the same viscosity as your original oil has, choose one with a difference of +/- 5cst. 5w40 and 15w40 are two different types of engine oil that seem and sound similar. 15w40 is perfect to use in an environment where the temperature range from -20 Celsius to 40 Celsius. Whereas, 5w40 is used in temperatures ranging from -30 to 40 Celsius. This is just one difference between 15w40 and 5w40, to know more differences and facts read How to Choose Between Rotella T5 & T6: Viscosity Grade Rotella T5. Two viscosity grades are available in Rotella t5, which include 10W-30 and 15W-40. It is a synthetic motor oil for your engine but is heavy-duty and built to last. A combination has been used along with some additives in this synthetic oil. The viscosity of hot oil is measured using different test parameters than when the oil is cold, so the numbers after the “W” don’t relate to the numbers in front of the “W”. The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature. Shell Rotella T6 15W40 and 5W40 – (quick overview) 1. Shell Rotella T6 Full Synthetic 15W40 Diesel Engine Oil. Shell Rotella T6 Full Synthetic 15W40 Diesel Engine Oil is a high-quality engine oil with a 5-star rating. It has been designed to provide the best performance in extreme conditions, particularly in hot and humid environments. LV6VIt.

difference between 10w and 15w oil