There are many engine oils that are poor in terms of quality under the same specification. Unfortunately, good quality and poor quality engine oils both look like same in physical sight. So, it is very difficult to justify the quality of oil at sight.
We know, the auto manufacturers recommend engine oil based on a minimum performing level to top performing oil set by viscosity grade. However, it is very difficult for owners to choose good performing oil because different lube oil blenders make oil from the secret formulation.
In our market, there are hundreds of non-standard engine oils are available those are claiming high oil drain interval oil but it uses poor quality additive formulations. In this case, extending the time between oil changes can dramatically increase the risk of lubrication failure.
Lower viscosity oils have been created to meet demand, moving over a short period of time from 20W-50 and 15W-40 to 10W-40 and 5W-30, and now into the 0W category. Most of Japan car manufactures already approved 0W-20 oils for the gasoline engine and 5W-30, 5W-40, 15W-40 for heavy-duty diesel engines.
Before using lighter viscosity oil in your car you should be careful. The running ambient, fuel condition, and high ambient heat or a defective cooler may drive down the viscosity suddenly. Even, there is also a big chance of lubrication failure for lower viscosity oil.
On the other hand, contaminant fuels are common in Bangladesh. Fuel dilution, an adulterated portion of fuel and chemical contamination can cause a sudden drop in viscosity. So, carefully monitoring the engine oil running hours considering traffic is your responsibility.
A recent statistics say vehicles moves normally 10-15km/hr and pick hours it goes down to 5-7km/hr in this Dhaka metro. It is noticed that without speed, oil films are not producible. This is why, it’s often said that each time you start your car, you are causing mechanical wear equivalent to 500 miles of driving.
Starts stops, coast-downs, slow speeds, and reverse-direction part movements are all oil film or viscosity starvation events. So, vehicle owners should be careful while choosing synthetic oils because so-called synthetic engine oils are flooded in