Of course you can but when you do you are changing the viscosity of the oil. Your engine requires a certain weight or viscosity of oil. Use only the weight oil recommended by the manufacture.
Viscosity tells you the speed at which the oil will flow. The lower the viscosity the faster the oil will flow at 210 degrees fahrenheit as in an SAE30 weight oil. Any oil with a W attached such as SAE 10w30 means the oil was tested at a cold temperature and will flow as a 10 weight when it is cold and then performs as a 30 weight at 210 degrees.
Oil weight, actually a measure of viscosity, is determined by the grade of oil, and the amount and type of thickening agents blended in it.
No. It has to do with how thick the oil is (viscosity) at different temperatures.
It is a multi-viscosity oil that is 5 weight when it is cold and becomes 30 weight when it is hot.
A US gallon of 90 weight oil weighs approximately 6.8 pounds. An Imperial gallon of 90 weight oil weigh approximately 8 pounds.
10w30
Example, 5/20 refers to the viscosity of oil at different temperatures. At cold temperatures, below freezing, the "viscosity" of the oil is "5" weight, meaning it is thinner and will flow easier. At higher temperatures, the oil is "20" weight meaning it is a little thicker to provide adequate lubrication. Lower viscosity oils may provide better fuel economy since being thinner will allow it to flow more easily. Refer to your owners manual for the proper viscosity of oil for you particular car/truck.
30 weight, we use Case IH motor oil 30 weight.
One quart of oil = 1.88 pounds The viscosity of the oil has no bearing on actual weight.
Around 90 weight gear oil. Check owners manual for viscosity but that should be close or a better auto parts store can look it up for you. 90 is pretty much standard for a lot of diffs.
Single viscosity is high quality oil. Mulit-viscosity oil is used for in the winter.