I shifted over to full synthetics about 30 years ago. It the time i was running a new f-100 with a 302. Average highway mileage went from 11.5 to 14 mpg with a noticeable improvement in power. There are a lot of advantages to the synthetics.
With a standard motor oil you really should do a oil change every 2000 - 3000 miles. You can safely go 15,000 miles between oil changes with a high quality synthetic. That's an 80 % reduction in the waste oil you're producing so that's good for the environment.
The synthetics give you smoother cold weather starts. ( That's where most of your engine wear comes from. )
They have a much higher vaporization point so you aren't pumping a bunch of emissions up through your PCV valve. That's better for air quality.
I've never had a motor fail in all this time. I even knew of a gent that was running a VW microbus with a cracked block. The base oil must have been 50% synthetic & 50% gasoline but that engine still wouldn't quit.
LOL ..... i guess you can tell i'm in favor of the synthetics ?
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