Originally Posted by mycroft
I have used Amsoil in numerous applications since 1981. When used as instructed Amsoil has shown that it performs as Amsoil says it will. Amsoil is known as the world leader in synthetics and invented the first api/sae approved synthetic in 1972 and it was Mobil who ripped off Amsoil, not the other way around. I would challenge anyone to conduct their own test against any lubricant made by anyone at any price. Amsoil warrants their oil and you can see that warranty at Amsoil.com. No other manufacturer has anything similar. Use what you want but Amsoil has always been the best.
Sounds like an Amsoil salesman. The analytical data Amsoil uses to show their superiority is a good indicator of their product's attributes, but it doesn't prove how well the oil will perform in an engine. Their cost per year stats use MSRP prices of oils, theirs is the only one not available at half MSRP. They show Mobil1 at over $9/qt and we know Walmart sells it for under $5. Their tests did reveal something interesting, Penzoil ultra which I've started using instead of Mobil1 has very good attributes for a $5 oil.
Mobil 1 did come after Amsoil, but there was no "ripping off" as they use different methods and base stocks. It's like saying that the first maker of smokeless gun powder "ripped off" the Chinese who invented black powder in the 9th century. Amsoil publicly welcomed Mobil1 stating that they believed it would increase their sales. They both have similar product defect warrantee coverage. Amsoil requires the vehicle owner to obtain and send in an oil sample, Mobil only requires that the owner allow Mobil to obtain a sample from the engine if they choose to. Amsoil has a much longer list of exclusions to warrantee coverage. Sounds to me like Mobil has a better warrantee. Mobil 1 is factory fill on many high end cars; Amsoil? Cost and availability make Mobil and all the other synthetics very attractive. Does Amsoil's -50 degree pour point benefit me in So. Cal.? Does it's higher flash point really benefit my Taco who's oil will never get hot enough to damage even the cheapest oil? Does a high mileage interval benefit me when my truck will do 3k miles/year and have to be changed anyway? None of my engines have 4 balls rotating under pressure at room temperature. Any oil will protect a long time. I bought a Nissan truck that had gone 4 years and 42K miles on factory dino oil and was still running fine even tho it was down to under 2 qts. I sold it a few years later still running fine and I used only the cheapest oils and filters. Mobil is easier to get, cheaper, and is easier to obtain warrantee from. Using Amsoil's best stuff it'd cost me $75 to do an oil change on my Taco. Using the 'Amsoil's best' thought I should also do the trans, diff, air filter
... If i did all my vehicles I'd have to mortgage the house.
Oil battles will continue forever. I'm in no way saying that Amsoil isn't great, but it's cost ins't justifiable to me or many other people.