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That isn't really PT barnum, BUT they are leaving something VERY important out.
Although you can keep the oil physically clean (remember the oil recyclers can recycle oil many times)
The additives in the oil wear out and then the oil itself wears out and turns into hydrochloric acid, I would estimate you can see this as a problem.
There are toilet paper filters on the market that can reclaim oil but then you also have to add additive packages (which are hard to find but still around)
and recycle your own oil. A lot of work normally
Also there is one lifetime oil change company out there that makes lifetime 50wt fully sythetic made motor oil. (its not the normal type, considered grade 6 whatever that means) It lasts about 100,000 miles between changes but requires a filter change and top off every 10k. They also sell an additive package that should be used with the product.
Both the above are possible but I find them distastefull because of the extra risk involved and the fact that they really aren't lifetime either. The cost to benefit ratio is actually poor because of the unmentioned costs associated.
Cheers
Ryan
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