The biggest difference is synthetic is better at low temperature and startup. Synthetic at the same weight (example 10W30) is not as thick at a low temperature. I have run conventional, semi and full synthetic. I have personally seen no measurable difference in fuel economy. I run full synthetic because of frequent starts and stops.
Quote:
Originally Posted by Mustangwill
Once a month, I put in some Lucas Fuel Injector Cleaner. I always notice a little bit of a difference when I do that.
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Does the increased cost make it worth while?