An oil that has a wide viscosity or thickness range. eg 10w40
900ml of4T oil 10w40
-20F to +100F
There should be no problem with mixing them.
10w40 Motorcycle oil
You can only use 10w40 if it is listed in your owners manual as an acceptable weight of oil for the engine.
The majority of 4 cylinders use a good 10W 40 Motor oil. No It Will Do Just Fine With 10W40
no car has to have 10w40 its only choice 10w40 means that the oil can range from 10 weight to 40 weight so its only if you want to run a thicker oil like to cover up a knock or something like that Secondary Answer: The above is not really correct. 10w40 has the cold flow ability of a 10 weight oil and is a 40 weight oil at full temperature. This does not mean that it gets thicker as it gets warmer, that completely defies the laws of science. There are currently no new US market cars that require 10w40. 10w40 was the recommended oil on some older cars.