It is pointless having any group discussion on engine oils. Everyone ends up raving about their favourite brand, and belittling the others. Then it comes the building their loved products up with baseless, unreferenced "statistics", and FUD to put down the others. Some members on KB are known for this, and not just on engine oils either. We end up with the same baseless "evidence" - opinion presented as fact, and personal remarks, ala ;

Originally Posted by
Quasievil
That page was a Amsoil test, hardly independant. Mobil 1 is the world market leader in synthetic technology, this isnt a comment of speculation but a comment of actual fact, the Mobil 1 brand is the flagship of Mobil and there is a large international following of the oil for its superior performance benefits, weather the Delvac Mobil 1, Mobil 1 or the Racing 4t mobil 1, each product is highly specified.
Believe me when I say you wont have an issue with Mobil 1
Incidently I run Mobil1 4T in my race bike a single cylinder engine the revs to about 9000rpm, it doesnt foam, so a big v8 engine reving at 2000 rpm per cylinder is unlikely to foam.
Well I ran Mobil 1 in a high performance diesel, and alarmingly, it rattled like a stone in a tin can, and yes I know the difference between diesel rattle and engine rattle.
It is a little unfortunate to suggest that tests done to the ASTM standards are "hardly independant." Perhaps you can point us at a higher testing authority you subscribe to, or maybe even include any reference at all for your statements, because at even second and third reading, they smack strongly of your personal opinion, and not much else.
Most companies make a product as cheaply as possible, and then go about fixing its problems. In the case of automotive oils - they use additive packages to address the deficiencies of the base stocks. They COULD just use a better base stock, but thats the pricey way to do it - they are far better off (financially) to resolve the issues as they come to hand (or rather as they embarrasingly come to the medias' attention), but then that causes other problems as well.
Take for example, while the base stocks might be stable, the additive packages are often not, resulting in damaging nasties appearing very quickly in the oil as the additive package breaks down, or the whole oil package not being remotely what the original specification suggested it was capable of.
It depends on the ethic of the oil company. Do they make engine oil to pass tests or do they make engine oil to lubricate engines?
Maybe you note that I do not side with any oil company? Mostly, the "best" oil for any task is overkill. There are only a very few exceptions to this rule, and even then, there are alternatives that will get you by.
Heres my first sentence again. It is pointless having any group discussion on engine oils. Everyone ends up raving about their favourite brand, and belittling the others.
Just use the correct viscosity, and change it regularly. 
Steve
"I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
"read what Steve says. He's right."
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