What does 'W' stand for in SAE 20 W40
This is the common terminology used to indicate multi-grade oil. 'W' signifies the winter rating of the oil, showing that it will perform well in cold weather. The lower the number prefixing the 'W', the lower the temperature the oil can withstand. Thus 10W- indicates a lower viscosity at low temperature than 20W-. The second figure shows the viscosity at 100 C,
What does the specification API stand for?
API stands for the American Petroleum Institute. This body has specified the performance standards of the oils that are used in vehicles. The letters API are followed by a set of two letters such as CF, CH4, SJ, etc. This indicates the specified performance levels. These levels have evolved over the years, from API SA to SM for petrol engine oils, API CF or API CH-4, for diesel engine oil and API GL-4 for automotive gear oils.
How do I choose the right oil for my vehicle?
One should always consult the car or vehicle manual, issued by the original manufacturer for choosing the right Oil.
Does using the right motor oil have anything to do with engine life?
One should always change the Engine Oil & Oil Filter as often as recommended by the original manufacturer's manual, to get long engine life. This is good maintenance practice.
Is it true that the color of used engine oil that turn to be black so quickly is not the good oil.
Generally, engine oil that is drained, or that has been used for a while, will turn to a darker color. This is because good engine oil will help disperse soot which occur from the combustion and keep the engine clean by mixing dust from the engine into the oil. That function will change the color of oil. But for good quality oil, the viscosity grade should still remain the same. Therefore, black color of engine oil is not a problem.
What are the possible reasons for an oil pressure drop?
The oil pressure may drop due to oil thinning down considerably, due to fuel dilution or maybe because of insufficient oil in the system. It can also be due to leakage or excessive oil consumption, or even a possible oil pump failure.
What are the possible reasons for excessive oil consumption?
Excessive oil consumption may be due to any of the following reasons:
- External oil leakages from areas like tappet cover, oil filter bowl, timing cover oil seal, rear main oil seal (flywheel side) or at some other point in the oil circulation system.
- Thinning of the oil due to fuel dilution.
- Excessive clearances between the piston and the cylinder can cause high oil consumption, as a little oil gets thrown into the combustion chamber during the process of combustion when the piston moves up and down, resulting in it also being burnt.