Originally Posted by JPA Cate
Giving the machinery oil and filter changes is the least expensive way of keeping it all running well
I bought a Nissan
Sentra new in 1988. The dealer set the car up for highway driving, so it took mid-grade gas and delivered 38 miles per gallon.
I changed the oil myself, twice as often as the manufacturer recommended and, while the manufacturer recommended 10W30, I used Kendall HD30.
Ten years later the car had 456,000 miles <--not a misprint) on it. While the oil had its yellow bloom for the whole interval between oil changes in the beginning, in the end the oil turned black immediately and did not require topping up between changes. Then somebody smashed into the right front fender
and a great pile of rust fell down underneath the car (this was in the southern Ontario
rust belt where the roads are salted in winter) and the car was Done. That car didn't owe me a thing.
The trouble free longevity was due to the short oil change
interval (oil wears out) and the Kendall HD30 oil.
(You have to remember your high school
chemistry.) The significance of the Kendall oil is this: In all the world all the oil fields produce straight chain carbon (aliphatic) oil. There are two exceptions, that produce oil molecules with benzene rings (aromatic). One is a small oil field in Russia
and the other is the small northern Pennsylvania oil field. Both oil fields are long depleted, but if you drive through the Pennsylvania oil field, rarely you will see the giraffes in a farmer's field working. They let the oil rest for a few years so the oil seeps into the void, and then pump
it. That oil goes (went) to the Kendall refinery nearby.
In the hostile environment
inside an engine, benzene ringed oil is harder to break down than straight chain oil. So it lubricates better. The Kendall logo is a hand with two fingers in a V, meaning you'd get twice the mileage between oil changes. And the significance of using HD30 instead of 10W30 is, 10W30 is more convenient but to do that it contains more detergent than HD30, which is what makes it multigrade; but the lubrication of that detergent is inferior. I wanted the lubrication of as much of the gorgeous aromatic oil as possible.
And when I changed the oil twice as often as the manufacturer recommended, it lubricated that much better. Oil wears out. Oil changes are relatively cheap, compared to a worn out engine.
Incidentally, we're told that that Pennsylvania oil field is where Pennzoil, Quaker State and others made their reputation, but they've long since changed to aliphatic feedstock. And a couple of years ago a major oil refiner bought the Kendall refinery, closed it down and is now blending the small stream of Pennsylvania crude into his aliphatic feedstock; he still sells Kendall branded oil.