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It an excellent points explained by salmanahmed, I only like to expand his last but not least point that mechanic's being in authoritative position can very easily brainwash customer mind in seconds. They love showing off the big drum they have for crappy brand and portraying that he himself is using same in his own car and other 20 cars that he service daily. This is the most common logic that is served worldwide, but my question or way to analyze the situation is bit different: My car is different from other 20 brands. So best is to go with OEM recommendation in the owners manual for the right type and specification. If you don't have owner's manual google fact as relying on the dealers info is also risky as some dealers twist and turn real requirement sometime for their business benefit and when you confront them they act dumb and say 10W40 and 20W40 is almost same and why I am talking too much.....? Once you 100% know which spec oil you want and which type synthetic or mineral then google the fact that your car manufacturer endorse or recommend which motor oil and go with them. This way you are super safe and steer clear from the crap sold in market for couple of bucks profit to screw your engine life.

Hi Jimmy, thats a great question to ask here's your reply: viscosity of the Oil: Regular Oil oil is more thick than the Synthetic Oil, so yes that is true what the mechanic said. But what he is implying is totally wrong. SO has special added chemicals which make is stick to the internal walls of the body and provide better lubrication. Enhanced engine cleaning and long term protection: Synthetic Oil's stick chemicals are better are capturing the engine particles and when the oil passes through the oil filter these particulars are collected in the filter. with Regular Oil these particles will find easy to hide place and start depositing their cause even greater damage to the body of the engine as the engine gets old. Built for the cold weather: in winter, Regular Oil at the bottom of your car's engine will take a long time to heat up and become thin enough to flow through out the engine body. Synthetic Oil on the other hand is designed to be thin and can get to every engine part much quicker than Regular Oil. More heat absorption: Regular Oil with age does absorb enough heat and it being thick makes it hold on to the heat much longer. on the other hand Synthetic Oil is thin and it can absorb and releases heat quickly and this is why the SO has a longer life than any Regular Oil. Oil flow resistance: thicker oil like Regular Oil needs more force to flow through the tightly packed engine body. This is why the marker of Synthetic Oil make the Synthetic Oil thin so that it can flow easily with out any or very little resistance. Better Fuel Saving: thick oil needs more force to flow which cause a burden on the engine and hence increase the engine load and requires more fuel. whereas, Synthetic Oil are built thin and they can actually help you get at most 7% to 10% fuel saving. Synthetic Oil the champ of Turbo engine: If you have a Turbo engine then you would know that the turbo itself gets extremely hot. Synthetic Oil is design to withstand this temperature. Regular Oil simply cannot handle this much heat and will last far less than Synthetic Oil. Why do mechanics recommend certain brand or type of Oil: they work on commission basis and they probably have 2 or 3 type of brands in-house. for each they have a sales target. if you buy from them then simply make more money on their recommended brands. Hope that this helps

Thanks @salmanahmed and @robert for sharing this information. Here is an Image which shows different oil rating against different temperatures

thanks for share such good info @robert . here is a good image explaining different ratings of Engine Oil for regular and synthetic oils.

Next question is: Now what after 142....Pokemon Go? and second question is how many people or roads he harm while catching 142 pikachu? Shame on you 142er! It's really unbelievable to see how grown up adults doing this sort of stupidities these days. Is there is any cash motivation in the game that increases if you get more pikachu's? As I never played this game before.

Well, Well, Well ... in case any Pokemon fan is wondering that how much you have to walk to catch'em all.. its 153 km ... http://www.gamesradar.com/someones-caught-them-all-in-pokmon-go-and-walked-153km-to-do-it/ Caught : 142 Seen : 142 Now the player can Rest In Peace