Unveiling the Secrets The Truth about 10w30 vs. 10w40 Oil

10W-30 oils had better base oils and less viscosity improvers due to the narrower spread in viscosity, which is preferable. 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 ... If your engine specifies 10W30, using 10W40 won't present any changes. It's just a little thicker after the engine has warmed up, and will ... Will you pick engine oil 10W-40 or 10W-30 for your car? Not every car driver know how to choose the best car engine oil for themselves. 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 ... An oil grade of 10W-30 generally works for places where temperates are pretty high. Basically, the lower the Low Winter (W) viscosity, the ... 10W30 has the viscosity of 10W at 0°F but doesn't thin out any more than a base 30 oil at 212°F. 10W40 also has the viscosity of 10W at 0°F but ... 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 You must have seen the SAE symbol on the oil cans, for example, 5W30, 5W40, 10W40 or 20W50. If 10W40 is taken as an example, the number 10 ... 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.