Type of car oil grade and it's qualities?

How many types of car engine oil's grade and what are the benefits ?Type of car oil grade and it's qualities?
Some of the common multi-grade oils are:





5W-20


0W-30


5W-30


10W-30


0W-40


5W-40


10W-40


15W-40


20W-40


20W-50


Eg. 10W-30 designates a common multi-grade oil. The first number associated with the W is not rated at any single temperature. The ';10W'; means that this oil can be pumped by your engine as cold as a single-grade 10 weight oil can be pumped. ';5W'; can be pumped at a lower temperature than ';10W';. ';0W'; can be pumped at a lower temperature than ';5W';, and thins less at temperatures above 99掳C (210掳F). The second number, 30, means that the viscosity of this multi-grade oil at 100掳C (212掳F) operating temperature corresponds to the viscosity of a single-grade 30 oil at same temperature. The governing SAE standard is called SAE J300. The motor oil grade and viscosity to be used in a given vehicle is specified by the manufacturer of the vehicle.Type of car oil grade and it's qualities?
The answer the guy gaveyou is nonesense.





the first number is the weight or thickness of the oil.


5 thin


10 medium


20 is thick.





many European cars recommend 20W while many American and Japanese fuel injected cars require 5W





It is easier for your oil pump to circulate a light oil like 5W, but can lead your car to overheat in extreme circumstances. A heavier oil will keep your car running cooler but can put strain on a lighter oil pump.





The second number is the rating of how much ';heat the oil can absorb. Because a heavier oil is more dense it can absorb more heat.





Unless you are in an extreme temperate area, most modern cars will do just fine with 5W30. If you are a heavy commuter or operate in harsh climates, you may want to consider 10W40.





20W50 should only be used in harshest of circumstances unless your engine was specifically designed to use it. I have known some people who have use 20W50 on an engine that is nearing the end of its life. The idea is that a heavier oil will keep a worn out hot burning engine in check.
Simply a multi grade oil, say 5w-30.... it is a 30 weight at operating temp, and acts like a 10 weight in the cold weather (it can be pumped like a 10 weight)





The heavier the oil never means less heat....., 20w-50 is reserved for engines with way out of wack clearances.... and worn rings that have lots of ';blowby'; by the worn cylinder walls..... (thicker oil fills up a wider gap better then thinner is what is being done)








Essentially every car today recommends 5w-30 except the very newest cars that have gone to 5w-20 (20 weight oils) to sqeeze out more mpgs..... of course your car must state thats a acceptable weight to use....





5w-20 has shown in most cases to decrease wear then compared to a 5w-30.
To keep it simple:





5W30 - is a thinner oil that should be used in the winter


10W30 - is a thicker oil that should be used in the summer or for the older cars that burn oil





5W30 = 5(viscosity), W(winter), 30 (temperature)








-rocketsfan4lyfe
If you own a newer car use the tinner weight oil because it can get in and lubricate your engine better todays engine are built with a much tighter tolerance and need to run thinner oils on the other hand if its an older car run the thicker oil to fillin the gaps.