MikeTerp: Well, I think many of us would like to see the "data" showing that frequent oil changes may be counterproductive.
"aged oil" lubricates better than fresh oil.
There is a similar SAE study that showed that fresh oil (as in an oil change) dissolved the anti-wear layer laid down by the aged oil before it gradually, over several thousand miles, built up its own anti-wear layer. Unfortunately, I didn't bookmark it, so can't provide a link. But it would seem to confirm the above study.
The thread (below) on the BITOG oil forum, concerning intake deposits in gasoline direct injection forced induction motors, references data that indicates that shortening the oem oil change intervals can "negatively affect" intake deposits. Look for the comments made by Doug Hillary. He is a euro-based lubricants engineer with decades of experience with Castrol and Mobil.
Can we make this a data-driven discussion? Can anyone show, or reference, a contemporary engineering study that shows that adhering to an oem's recommended oil change intervals results in increased wear or reduced durability of an engine? Or, to put it another way, any links to engineering studies/research showing shortening of oem's oci's prolongs engine durability?
'14 328d, '13 M3 ZCP, '12 535i, '11 335d, '09 Z4 DINAN Stage II, '05 330i ZHP, '05 M3 ZCP, '02 M3, '91 328i, '90 535i, '88 528e, '88 M5, '87 M6, '95 Z3, 95 M3, '93 M5, '87 325e, '89 535i, '86 635i, '73 Bavaria.