Originally Posted By: CATERHAM
Originally Posted By: Shannow
If thinner oils mean that the engines and cars wear out at closer to the same time, not only is that fuel efficient, it makes more sense in the overall life of a vehicle.
People just have to realise that compromise is real, makes sense, and that 20s aren't there to make your engine last an extra 0.5 vehicle lifetime.
Bollocks.
As every manufacturer will tell most engine wear occurs on start-up and during warm-up.
When a manufacturer spec's a 20 grade oil particularly a high VI synthetic 0W-20 over a cheap heavier dino it's all about maximizing engine efficiency and minimizing engine wear when it's most likely to occur. Under extreme use at high oil temp's the manufacturers have taken step's to insure it is still viscose enough; there is no lubrication advantage in running anything heavier.
What some people have to "realize" is that it doesn't "make sense" to continue to hold onto old outdated automotive lubrication notions.
I think what Einstein said about common sense applies here:
"Common sense is the collection of prejudices acquired by age 18."
CATERHAM,
the pumpability issues are addressed with the pumability specs....i.e. the 0W.
Most wear occurs during warm-up, undoubtedly true...but the oil is clearly present in the wear pints during that phase (unless the 0W, 5W, 10W, is being grossly misapplied like the Esso videos, but that's not the topic.)
As per repeated requests...
* pleas tell the crowd which stadard tests are used to mesaure startup wear (by the API, ILSAC)
* where is the evidence that 20s, high VI outperform any other viscosity in these "INDUSTRY STANDARD" cold wear tests.
* please explain why they use such complicated and expensive tests, when by your assertion, it could be replaced by VI.
* Why the manufacturers of these high VI lubricants (e.g. Honda) talk "efficiency while providing acceptable wear".
As an aside, "Bollocks" was the very fist thing that went though my mind when you attributed the taxi wear used oil tests to "improvements in lubrication as the oil thinned out", when you had nether read the paper, not understood it's premise...with the preconceived bias that you bring yourself.
