If we Westerners wanted to really sock it to the Mid East oil barons and our own oil companies we should stop changing the oil in our autos, especially at 3k miles when mfgs recommend usually 7500 or more.
Dumb, you say?
got the following over a radio auto guro (LIKIS) in Pensacola years ago. He, LIKIS, was picked up by ABC nationally w/auto talk show and sought for endorsments by major accessory manufacturers. Thi is his recommendation ... change the filter regularly and replace the lost oil, usually one qt (that's u.s., fozzer because motor oil doesn't "wear out" it simply gets dirty and distributes the dirt throughout the engine. so, get it clean initially and then CHANGE THE FILTER ONLY.

I'm doing just that w/my ford Ranger, 125k on it now.
papa-metro usaf 1953-57

That may well be fine for your Ford Ranger, but, I still would advise against.

I change the oil & filter on my car every 5000Miles (inside the recommended mileage by quite a way) as my old 318i was still using NO oil @ 175,000miles when I sold it, I think I have the right idea.

I think you may well have This story
in mind ?

My truck, has new oil on average @ 55,000KM, as recommended by the manufacturer, Scania.

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Source

Just keep t the book...

PPO is a different story, as the stuff leaks through the seals into the oil, and sometimes takes crud from the fuel tank with it

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while i concede the point that it saves some money to change the oil at wider intervals, how much do you think it will cost the oil barons?
esp compared to fuel revenues

i'd say you can give them much more just driving your car so you get a mile further with the gallon

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This is a good prank for someone with a nice car.  Smoke everywhere.

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Thats not true, even if you take great care of your engine-it will still eventually begin to burn oil.  Motors burn oil when they get worn because the cylinders are slowly worn larger-the rings on the pistons also begin to wear so the seal is not as good.  This will cause oil to leak pass the pistons and into the firing chamber and get burnt.  Now, if you change your oil regularly, it wear's slower.  So, changing your oil on a regular increases the lifetime of the motor and therefore won't begin to burn oil as fast.

On top of that, all motors (new and old) do burn a little oil.  Oil by nature is slippery (thats why its used to lubricate motors) so a tiny bit will leak past the rings and get burt even in a good healthy motor.  Of course, you only notice this if you go a long time without changing your oil (so enough to notice gets burned).

So, in the end, like Wind-Farmer said; changing your oil is important to do on a regular basis.  I try and change mine about every 5000 miles (or once a year, which ever comes first)

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Well, it depends on how worn the engine is.  If the engine is worn, you may have to add a quart of oil every few hundred miles.  Before I had my trucks engine rebuilt, it was burning a quart of oil every 100 miles (but adding oil was cheaper than a new motor).  

A good motor won't burn too much (although you may find it a little low after about 5000 miles) but an older motor will burn a fair amount if it is worn.