Following discussion in other threads on HTHS affecting fuel consumption (it certainly does), I thought that the following might be interesting.
http://www.infineum.com/sitecollectiondo...ns%20051209.pdf
PDF, so I can't link pictures, but shows the different tests under the VID, and where the oils of varying viscosity sit in the different tests.
Backed up with HTHS 100 and 150 regressions, which show a virtually linear saving of fuel versus the reference lubricants...interesting should one extrapolate the line.
http://www.infineum.com/sitecollectiondocuments/notebooks/gf5/ResearchReport.pdf
Gives a bit more detail on the tests themselves, and why the test engines was chosen...in part to explore the fuel economy savings that are applicable with friction modified lubricants, running in boundary regimes, versus the older test mule.
Section around table 20/and figure 57 shows the conditions under which this engine is operating under boundary/mixed lubrication, and it's not that onerous a duty point in general.
Thus, I re-assert that modern engines and oils are not always operating in the hydrodynamic range, and that the quest for economy has reduced the operational viscosity margin even further, with routine operation in mixed/boundary mode.
OEMs are choosing lubrication regimes for their customers that will deliver their economy requirements, at the expense of ultimate engine protection...probably enough for 95% of the drivers of said vehicles to get their money's worth out of them.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=3023259
Note before people reply...this is NOT pointing at a pile of failed engines in the corner...
http://www.infineum.com/sitecollectiondo...ns%20051209.pdf
PDF, so I can't link pictures, but shows the different tests under the VID, and where the oils of varying viscosity sit in the different tests.
Backed up with HTHS 100 and 150 regressions, which show a virtually linear saving of fuel versus the reference lubricants...interesting should one extrapolate the line.
http://www.infineum.com/sitecollectiondocuments/notebooks/gf5/ResearchReport.pdf
Gives a bit more detail on the tests themselves, and why the test engines was chosen...in part to explore the fuel economy savings that are applicable with friction modified lubricants, running in boundary regimes, versus the older test mule.
Section around table 20/and figure 57 shows the conditions under which this engine is operating under boundary/mixed lubrication, and it's not that onerous a duty point in general.
Thus, I re-assert that modern engines and oils are not always operating in the hydrodynamic range, and that the quest for economy has reduced the operational viscosity margin even further, with routine operation in mixed/boundary mode.
OEMs are choosing lubrication regimes for their customers that will deliver their economy requirements, at the expense of ultimate engine protection...probably enough for 95% of the drivers of said vehicles to get their money's worth out of them.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=3023259
Note before people reply...this is NOT pointing at a pile of failed engines in the corner...