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Aftermarket "performance" plug makers have some very nice testimonials as to why they work, but "data" and testimonials still don't make them work.
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Absolutely true.
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If using those things were so good, don't you think automakers would use them so they can advertise that you only need to change oil every 30k, 50k etc? Why don't they?
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This is America, Rich. Do you think CAFE is about fuel economy? Nope. It's about allowing more units to be produced. It's a managed thing. Our whole life is wrapped around the worship of the automobile.
Ford wanted to use 5w-20 oil for their EPA certification. The EPA said "fine" ..but you've got to take ALL THESE STEPS to assure that reasonable continued usage occurs in the field after market. Hence, MC 5w-20 was born and MASS MARKETED.
Ask VW/Audi about how many engines were sludged or destroyed when they spec'd exclusive oils that were only available at the dealer. They over sold their product to the point where they could not service it. Busy automotively immature American numb drivers going to quick lubes that never heard of a 5w-40 Euro spec'd oil and the dealer wanting $100 for an oil change. Guess what happened? If you had been keeping up with it, you then saw that a MASS number of VW/AUDI/MB/BMW spec's started appearing on OTC SYNTHETICS after they got their clocks cleaned with class action law suits and providing extended warranties.
side note: Toyota/Lexus has outright design issues. Amsoil even has TSB's out specifically stating that they aren't suitable for extended drains. In these engines, such a routine would not be unwise (3k/3m).
America cars support too many subordinate industries. The service sector ..the transition for OEM to aftermarket parts sector ..the fuel sector ..tire & rubber ..road taxes ..you name it.
For your edification, GM IS coming out with a longer drain oil for OEM use.
GM Gives Glimpse of GEOS
btw- Amsoil limits their recommendations (without UOA) to one year (OTR disels will be different since UOA is typically part of a program). The mileage, depending on product, can be up to 35k under normal service and 17.5k under severe. I have a few customers doing one year oil change intervals. One young woman wanted to do it on her 99 Lumina. Since that was one of the engines with the faulty lower intake manifold problems, I did a UOA on her sump for no charge when I put the SSO 0w-30 in the car. Sure enough, she had coolant intrusion into the oil. The oil reports showed the condition was there, but manageable. The oil, after 13k (her annual mileage) was still good. The wear metals, OTOH, were skewed and elevated due to antifreeze intrusion.
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The multi vis oils have the additive that supposedly makes them vary according to temp, but the previous post shoots that down.
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Here's what's missing in your words here.
What does a 10 weight oil appear like @ -25F? Extremely THICK (but not as thick as a 30 weight WOULD)
What does a 30 weight oil appear like @ 212F Extremely THIN (but not as thin as a 10 weight WOULD)
That's why looking at a room temperature bottle and thinking that it thins as it gets cold and thickens when it gets hot is ...hmmmm distorted. It THICKENS LESS and THINS LESS over a broad range of temp. That's it's Viscosity Index ..or VI. The amount of change that occurs over a given temp span.
Here's how you could have made the original multi-visc oil (old rules). You would take a 10 weight oil ...take it to a cold temp that was the limit of its pumpability ...and you call that 10w. You would then dope it with polymers (essentially plastic) that were coiled tight when cold ..but unwound when heated .....so that you "simulated" a 30 weight @ 100C. These polymers tend to physically shear in the mechanism of the engine. These first multiviscs led the old schoolers to reject them for the use of either SAE 20 or SAE 30 depending on temp.
Or you could add pour point depresants ...take a 20 grade basestock ..and just dope it less.
This is why Ford had very little trouble getting a 5w-20 to work. The vast majority of the rolling fleet was running 5w-20 and didn't even know it. They called it 5w-30 on the bottle. It would shear within a 1000 miles. Remember that old Sunoco commercial back when you typically had SAE 30 (good) 10w-30 (better) and 10w-40 (best) ath the gas stations? The commerical would say "some 40 weights will degrade to a 30 weight by the time you reach Floriday (form some northern state). It was true.
This was the way most of us ran on conventional oil up to about the mid 80's ..there abouts where refining technology advanced and we ended up with Group II basestocks. I'm not fully versed on the fine details, but the processes produced even broader VI base stocks
The vast motoring public operates an engine for 20 minutes or less. That's how long it takes for the oil to reach full operating temp in a non-exchanged engine. Up to that point, you're pumping HEAVIER OIL. That HEAVIER OIL takes more hp to pump. It's a parasitic loss. The thinner the oil or the broader its VI, the less energy will be spent during that warm up process. If you're doing a short trip, even with a 20 weight, you're probably off the SAE scale when you turn off the key.
That's the WHOLE deal there on the evolution to thinner oils.
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Have a look at expensive race engines - F1's and the like - ones that have to sustain long periods of hard running - not 10 second or less drag stuff. They don't use the multi vis stuff - it reduces the lubrication qualities.
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..and if you had to endure only 500 miles at high output, you're using whatever keeps the engine just shy of self destruction. Some of the new rules limit the number of engines for a season (or was it races per engine). The oils are formulated accordingly.
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Everyone has a choice. Some like the hype, some prefer reality.
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As I said, Rich ..people form opinions based on their snap shot experiences and it's more or less cast in stone. It's a common failing. The world is a dynamic place and while you've been distracted after you already learned enough to figure that you needed to learn no more about a topic ..it quietly decided that you weren't going to be the last word on what was "good enough". Life is not filled with AMC based 4.0 engines that can trace themselves back to (heck, when was it?) the 60's.
Opinions are hard to change once set ..but facts are facts.
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Amsoil - never seen it in stores as I recall - do they sell by having parties like Tupperware?
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Funny

Amsoil is a niche product. It is sold at some retail outfits ..it's just not offered on a "chain wide" basis. Some franchise NAPA's will have it ..or anyone who wants to stock it. Many garages carry the Amsoil line for those customers that want it. Otherwise, you can buy it on the internet, just like people do for Red Line or Royal Purple ..which, although being at some chain retailers, still has very limited distribution at the retail level. You can't find it anywhere.
Amsoil does have one Group III offering. The XL line is designed for an alternative to the 3k/3m quick lube market. It's designated as a 6m/7500 mile oi. So while Iffylube and every other swinging joint is convincing you that you need to change your oil out like underwear, Amsoil is trying to break that prison of old school thought.
btw- if I had some babe in the woods ..one that treats a car like an appliance, I probably would have a hard time telling them anything else besides 3k/3m. It would be for their own protection. If they aren't gifted with the brains to check their oil and take car ownship seriously, they need to pay the added costs by visiting the vulchers just to get the services that they may not be capable of keeping track of themselves.
Those who ARE conscienscous ..yet want the liberation of not having as many scheduled service events are people who I can bring value to.
Again, I won't promote the oils to anyone that I can't bring value to in terms of avoided costs in $/time. OTOH, I have no trouble with the other drive train lubricants at all. They are so superior to OEM and are so infrequent in incidence of service it's a no brainer for me.