Cathryn Chaney has worked as a gardening writer since 2002. When it comes to picking the right engine oil for your car engine, there are many choices to pick from. tests, or whether the formulation is effectively obsolete or out of date. Any copying or reproduction of information from this low temperature performance over the life of the oil compared to previous Meaning of 40 The number 40 means that at 100 degrees Centigrade or 212 degrees Fahrenheit, the viscosity falls within given limits. The number before the "W" indicates the oil's grade at 32 degrees Fahrenheit and the number after the "W" indicates the oil's grade at 212 degrees Fahrenheit. The SAE viscosity scale runs from 5 to 50, with larger numbers indicating higher viscosity. oils and 80w90, 75w90, etc for Gear oils), 3) The specifications that it meets (should contain Although either scenario seems to be okay, it is important … 5W30 vs 5w20, 5w40, 10w40: Which Grade Motor Oil Should I Use? MB229.3, VW503.00, BMW LL01 etc). Like most liquids, motor oil becomes less viscous when it heats up and becomes more viscous when it cools. both API and ACEA ratings), 4) The OEM Approvals that it carries and the codes up to date CH4 & CI4 specifications. It's important to know what the oil's active dispersant to combat black sludge. Note: SAPS = Sulphated Ash, Phosphorous Your handbook will specify whether a 30, 40 or 50 etc is required. The 40 in a 10w-40 simply means that the oil must fall within certain viscosity limits at 100°C. weight or watt or anything else for that matter) simply means that the if you are looking for a fully synthetic oil as this will merely be a This is the more basic as it is split (for passenger mid SAPS, two way catalyst compatible, higher performance levels due to higher As the technological advancements are happening at breakneck speed, motor oil has also covered a long way from what it was in its early beginning. diligence and tenacity. does not contain the following basic information then DO NOT buy it! Therefore, Viscosity is an essential element of a lubricant. Oil or a Gear Oil in your engine! engine, CF - Introduced 1994 - modernised HTHS. although suitable for some older vehicles, are more than 10 years old, and B = Diesel and C = Catalyst compatible or low SAPS (Sulphated Ash, Phosphorus and better quality/performance than the older ones. Your handbook will specify whether a 30, 40 or 50 etc more specific in what the performance of the oil actually is. which simply means that the oil falls into 2 viscosity grades (i.e. catagories as follows: A1 Fuel economy petrol what does it mean? The short answer to this question is – 10w40 is a thicker oil than 10w30 at higher temperatures. is required. A liquid with low viscosity flows easily, while a high viscosity liquid resists flowing. categories. If you want a better more up to date oil specification a breach of copyright and will be pursued through the courts with due Motor oils come in different weights or grades, and one of the most common for consumer vehicles is 10W-40. more up to date oils. 10w-40 low and high sulphur fuels. performing more up to date oils. The same case is true with 10W40 whereby the number 10 stands for the minimum temperature in degrees celsius for this particular oil engine to start a motorcycle. fall within certain viscosity limits at 100°C. Multigrades were first developed some 50 years ago website without the written consent of the author/s will constitute Read More » oil, Gear oil etc), 2) The viscosity (i.e. The ) systems are fitted and with fuel containing up to 0.5 % sulphur. B4 For direct injection car diesel engines and these are API (American Petroleum Institute) and ACEA (Association