I went to the store to get sum oil for my car and they range from 2.79 to 9.99. Now a days with with money being scarce lol, is there truthfull really any difference between the each brand? I know have different additves and what not but they all meet or exceed the minimum requirements so is it really truthfull any big difference between a 2.79 and a 4.99 bottle, cus all it really is difference is a name making the price different.