Mastering Engine Oil Viscosity 10W30 vs 10W40 - Which to Choose?

10W-30 · 10W-40 · 15W-40 · All viscosities · By Fuel Type · Petrol / E10 · Diesel · Racing ... eg HPR 5 or MC4ST 10W-40 to display full list of multi - vehicle ... The newer 10w40 is better for valve train noise. Is this true? I have typical "loud" valve chatter/ injector "tapping" noise on my gen 2rt10. The main difference is that 10W40 oil is thicker than 10W30 oil at higher temperatures. Both have almost the same characteristics – the only difference is the ... 10W30 and 10w40 are very similar oils. Both oils are flexible, multigrade oils that perform well in different temperature ranges. 10w40 oil is almost always better unless you make many short trips in winter as 10w30 oil is less viscous when cold. Honda recommend that the CBF1000 uses 10W30, known as the viscosity numbers. The “W” stands for “winter”, which relates to how the oil will flow when cold. 10W30 and 10W40 are made from the same base (assuming we are comparing oils from one manufacturer) with different amounts or types of polymers ( ... The difference between 10W30 vs 10W40 viscosities is the thickness at hot temperatures. During the cold temperature, they flow at the same rate. 10w30 will give you a bit better protection during the summer when it gets warm and 5w30 during the winter if it gets cold. Top ... In the 10W-40 engine oil, the 10W (W = winter) simply mean the oil must have certain viscosity or "thickness" flowing at low temperature. The lower the "W" ...