What is the difference between 15W-40 and 10W30 engine oil? 15W-40 is better for extremely hot conditions such as towing, hauling, and stop-and-go driving. 10W-30 is better for protecting engine components for more extended periods between oil changes. 15W-40 is better for active engine components, like oil pumps and bearings. 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. 5W40 vs 10W40 – Differences. The main difference between the two oil types is that one is thinner than the other. The 5W40 is thinner than the 10W40 at lower temperatures. But when the temperature is higher, both motor oils similarly perform their intended functions (using the same viscosity). AMSOIL Formula 4-Stroke Marine Synthetic Motor Oil is available in 10W-40 and 10W-30. We offer the complete line of high-performance AMSOIL Marine Products. We look at a 25W-40 motor oil replacements for 4-stroke Mercury and Mercruiser marine engines. Available at a price that beats your Mercury dealer's prices. 10w40 motor oil is a bit more expensive than 15w40 motor oil. 10w40 is thus an ideal motor oil for the moderate engine, such as light vans, SUVs, and passenger cars. If your car is a highway fleet that needs regular oil replacement 10w50 is much preferred as an ideal budgeted oil. PkQpC.

difference between 10w and 15w oil