er, yes they have. that's why they have "economy" branded blends.
of course, because amsoil marketeers are f*ck-heads, that means all the technology of all other companies is bogus!
but you just said that there's no such thing as better economy. you /do/ know that economy and viscosity, what affects cold starting, are related don't you??? oh, wait, maybe you didn't.
yup. and remaining fiercely ignorant is a fabulous way to go through life.
Actually, if there is less friction, there is better fuel economy.
And to meet the oil standards set by the API, the oil has to save fuel. And, the engine will last longer.
Overall, though, the savings are small and only a small percentage of people will actually have their cars long enough to benefit from a longer-lasting engine. Most people sell their cars well before this or the cars have other problems, like that a crash, that ends the service of the car.
They only claim the increased fuel economy for 0W20 and 0W30. Yeah, since it's not possible to make a 0W20 or 0W30 with petroleum base stock, they have a point there. But even for the "Advanced Fuel Economy" products, they keep going back to "during warm up" every time they make a claim of reduced friction or "saving" energy.
"During warm-up, Mobil 1 Advanced Fuel Economy flows faster because of its lower viscosity to minimize metal to metal contact to reduce friction and wear."
"During the warm up phase, the Mobil 1 fully synthetic formulation because of its lower viscosity flows more easily through the oil pump, requiring less energy to pump the oil to the critical engine parts."
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" But for their "regular" synthetic oil, 5W20 and 5W30, they make no claims of increased fuel economy.
no, but i've been to the tar pits and they're rank. my point is, while i don't think it's a good idea to wantonly spread oil anywhere, nature does a pretty good job of spreading that stuff about on its own.
No offense, but you need to learn to read for comprehension. Nowhere do they make a claim on that page that their 5W20 synthetic base stock product provides better fuel economy that a comparable 5W20 petroleum base stock product.
Why don't you show a _single_ independent study that shows a benefit to most people. Oh, wait, they're aren't any!
After all these years you'd think that there would be at least one published study that showed a provable benefit in terms of wear, MPG, or extended change intervals for synthetics uses in non-high performance engines, operated in moderate climates. But there aren't _any_. There's anecdotes by users of synthetics, there's claims by companies like Amsoil which have never been validated, and of course various claims by MLM people selling Amsoil. Just choose your benefit from one of the hundreds of MLM web sites!
Of course there probably have been plenty of studies that were done but not published because they didn't have the results that the company paying for the study wanted.
It's amusing that not even Mobil, who would have the most to gain by some evidence of increased fuel economy for synthetics, can make that claim. All we see is a heavily qualified statement that logically makes no sense:
"Actual savings are dependent upon vehicle/engine type, outside temperature, driving conditions, adjusting tire pressure, and your current engine oil viscosity."
Huh? So adjusting tire pressure affects how well synthetic oil works (as opposed to how well dino oil performs, LOL). And how does your current oil viscosity, if it's the same as the viscosity of the synthetic, make any difference.
So here's what Mobil thinks you should do:
Change to a lower viscosity of synthetic base stock oil than the petroleum base stock oil that you're currently using
Drive only in extremely cold temperatures where sythetic has a benefit at start-up.
Adjust your tire pressure, from the previously under-inflated pressure you had with your petroleum base stock oil, to the proper pressure.
Far as I'm concerned, SMS is a long-haired maggot-infested dope-smoking FM type. If he was called to give professional testimony, as a judge, I'd have the whole thing stricken from the record as being unreliable.
Of course it does, but Mobil is being disingenuous when they claim that tire pressure has an effect on how well their synthetic base stock oil performs versus how well a petroleum base stock oil performs. It makes no difference. You should keep your tires properly inflated no matter which type of oil you use.
And if you change from 10W30 petroleum base stock to 5W20 petroleum base stock you'll see the same change in fuel economy. Of course you should not make that change no matter which base stock you're using, but that's another matter entirely.
Mobil is trying to get people to change multiple variables at the same time, one of them being the base stock of the oil, then claiming the increased fuel economy from switching to a lower viscosity oil and proper tire pressure is due to the change in the base stock.
Even for their "Advanced Fuel Economy" formulation, the increase in MPG isn't due to the base stock being synthetic, except for the fact that apparently it's not practical to make a petroleum base stock 0Wxx oil. Even then, they're hedging their bets, admitting that the advantage is during start-up, not during normal operation.
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