by 
ory123
ANSWERS: 2
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15w-20 is the viscocity index SAE of the oil according to API (American Petrolium Institute). It doesn't have anything to do with Synthetic or not. At the cans shall be indicate clearly if the oil are synthetic or not. If there are no synthetic oil mark than it's not synthetic. 15w-20 mean when the oil is cool it will have viscocity index at 20 and when you run the car and oil start to thin at viscosity index at 15. Lower the SAE grade the oil will be thinner and higher SAE the oil will be thicker.
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It is a fully synthetic motor oil. According to Mobil Corporation, The answer to the Question "Is Mobil 1 with SuperSyn Technology a fully synthetic motor oil? Their Reply: Yes, it is. To meet the demanding requirements of today's specifications (and our customers' expectations), Mobil 1 with SuperSyn uses high-performance fluids, including polyalphaolefins (PAOs), along with a proprietary system of additives. Each Mobil 1 with SuperSyn viscosity grade uses a unique combination of synthetic fluids and selected additives in order to tailor the viscosity grade to its specific application." I use it and I like it.
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