10W30 vs. 10W40 The Ultimate Guide to Choosing the Perfect Engine Oil

In the winter, the oil will not get quite as hot as it would in the summer (unless u live in the desert, cali or florida where its always warm), ... 10w30 is a more all year oil for a very broad range of temperatures. It has more protection for lower temperatures than 10w40 at the cost of being not as good ... 10w30 and 10w40 are multi-grade oils this means that they can carry properties of different weight oils depending on the conditions. Both 10W30 and 10W40 oils are high quality and flexible, so they work well in cold and warm regions. However, there are some slight differences between the two. Both 10W-30 and 10W-40 are multi-grade engine oils, which means they carry properties of different weight oils, depending on the conditions. What would you expect the Honda rep to say? ;) 10W-40 is perfectly fine and comes in many brands. 40 refers to it's viscosity. 10w40 would be thicker than 10w30. 40 viscosity will work just fine in the bike. It is the more popular than the 30 ... 10W30 and 10W40 are made from the same base (assuming we are comparing oils from one manufacturer) with different amounts or types of polymers ( ... 10W-40 has a higher elastomeric content than, say, 10W-30 oil. That means more viscosity index improver content in a quart (or, by extension less actual oil). 10W40 has ten more W's than 10W30. There's a formula for it, and you can buy just straight W at any auto parts store, if you have a crankcase ...