10w30 vs. 10w40 Choosing the Right Oil for Your Engine

On the 94 Escort it is 5-30 winter and summer. In the 98 Explorer it is 5-30. In the 04 Explorer Ford specified 5-20. So I use that year round. Not so much for the heat reasons, but because the oil brand I purchase is only available in 10w40 weight. So short answer, there is no ... Scotty ... The car calls for 10W30, you won't gain any appreciable benefit using synthetic oils. You engine is suseptible to a number one main ... Quality engine oil formulated for your vehicle at Repco. Your local Repco stocks a 5w30 or any other grade of engine oil from Castrol, Penrite, ... 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). Researching which oil I'm going to use on my '12 1KRR, and page 138 of the manual says 10W-30 JASO MA, but goes on to list Honda GN4.. Well, which is it? GN4 is 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. What is the difference between 10W40 and 10W30 oil? Yamalube®'s 10W40 ... Yamalube Oil vs. Castrol Synthetic Oil, and Conventional Oil ... Motor oil grades like 10W-30 and 10W-40 refer to the oil's viscosity, or how easily it flows, at different temperatures. 10W30 is a thinner oil and flows more easily at lower temperatures than 10W40. This makes it a better choice for colder climates.