Quote:
Originally Posted by floydarogers
There are two arguments against changing it early
1) A special oil is used to fill the engine at the factory. If you change it early you lose the properties that help the break-in. Some people claim it is a "Fuchs" special oil.
2) Recent evidence seems to be accumulating that the most wear (other than normal startups, etc.) happens in the first 1,000-2,000 miles after an oil change, as the protections (ZDDP, etc.) bonded to the moving parts from the previous oil are flushed by the new oil, and that there is essentially no wear from 2,000 or so on until the next change.
YMMV. Lots of coverage of this on bobistheoilguy.com forums (which is quite an interesting place).
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+1
Over on the bmw diesel forum, there is a guy who decided to do his own test or study to confirm what many industry studies have shown. He drew a sample from his 335d thru the dip stick tube at 1k, 3k, 5k, 9k, etc and sent them off for used oil analyses. Using the ppm iron as the most important wear metric, he found that 40% of the iron wear metals in his oil at the 9k mark occurred in the first 1000 mi.
You've got to change the oil at some point (why not the drain interval spec'd by the mfr?) but strange as it sounds, fresh oil is a mess. It takes a while (approx 3k mi) before it gets its chemical s**t together in one bag.
By the way, the accumulation of wear metals in a new engine is nowhere near the "condemnation limits" that would require dumping the oil early. Modern mfring and machining methods + modern synthetics = old school oil change at 1k is completely out of date.
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'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.