Originally Posted By: Audi Junkie
Originally Posted By: 440Magnum
Originally Posted By: Audi Junkie
That's bunk because ACEA are self-reported specs. That is, no test sequence required. Even worse, XOM bothered to mention A1, although claiming no adherence to ACEA specs. I complained about this a while ago, A3/A5 is what DEFINES a synthetic oil!
And as was pointed out to you: the specs that it DOES meet, when combined, exceed every parameter of A5.
That's pretty funny. Let me get this strait, an A1 oil "combined with other specs" exceeds an A5 oil?
That's a good one. From the "more specs is better" school of thought?
Play dumb all you want, but I know that you grasp the concept.
Any spec consists of a number of parameters- each parameter is a radial on those spider charts you have often posted links to.
When an oil meets multiple specs, Spec 1 may have the highest requirement on parameter a, spec 2 may have the highest requirement on parameters b, c, and e, and spec 3 may have the highest requirement on parameter d.
If spec 4 comes along and doesn't have as high a requirement on parameter a as spec 1, doesn't have as high a requirement on parameters b, c, and e as spec 2, and doesn't have as high a requirement on parameter d as spec 3, then specs 1, 2, and 3
combined result in an oil that renders spec 4 moot and meaningless. In the case of this oil, ACEA A5 is the equivalent of the 4th spec in the example above.