To wear engines in faster you can add some of those same "impurities" that show up in oil because of use, put a super fine grit in your oil and it will cut away at the inner workings of your engine to seat bearings and hone the inside, then you change that grit filled oil so that your engine will last longer.
It is the same idea as synthetic oils, fewer impurities to start with because you are starting with a pure, natural gas based synthetically made oil instead of trying to filter out the grit, impurities and other junk!
Want to compare engines without spending a lot of money? look at lawn mowers, some people own their lawn mower for years without ever changing the oil, others change it at least once per year, the people who change the oil tend to have their lawn mower engine last 20+ years, the people who don't tend to replace their smoking, hard to start, wore out lawn mower every 3-5 years, that is why whenever I pick up a new or free lawn mower the first thing I check is the state of the oil.
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