The average cost for a conventional oil change is $46 ($25 being the cheapest and $50 being the most expensive), using synthetic blend bumps the price to $45-70 on average and to $60 to $100 for fully synthetic. In fact, conventional oils are not even offered at many repair facilities anymore.
So, if your synthetic blend oil change costs $50 and you only have to do it twice a year, compared to four conventional oil changes at $25 each, you're pretty much breaking even from a cost perspective. But what about the performance gap?
AAA recently performed a study that showed synthetic oil outperformed conventional oil by an average of nearly 50 percent in its independent evaluation. Synthetic oil can offer vehicles significantly better engine protection for only $5 more per month when following a factory-recommended oil change schedule.
Bottom line is, you aren’t going to hurt your engine if you skip the Mobil 1, one of the best-known synthetics. But you aren’t going to put yourself in the poorhouse if you flip for the synthetic, either. According to a Business Insider article, these oils add only $64 a year, on average, to vehicle-operation costs.