what is the difference for semi synthetic and fully synthetic if the Viscosity is same for both as in 0W-20 or any other grade. please guide
to my knowledge over the period of time Semi-Synthetic oil is a blend of fully synthetic oil and conventional mineral oil. Semi-synthetic oil is easy on wallet than fully synthetic oil as it comes at a reduced cost whilst still giving you some of the benefits of full synthetic oil.
Synthetic oil is a lubricant consisting of chemical compounds that are artificially made. Synthetic lubricants can be manufactured using chemically modified petroleum components rather than whole crude oil, but can also be synthesized from other raw materials.
viscosity of the oil is Key factor for engine lubrication.