this contradicts the other theory on this board about engine cleanliness is important for long engine life. which would you rather have..a clean engine with dino 3k interval or lower wearing engine with 10k syn interval?
What the people who did that test ignored was the fact that those "dirtiest" first few thousand miles were run during the tail end of the engine's break-in period. The wear metals went down after the engine finished breaking in. They didn't seem to notice that, and instantly thought that it was the new oil causing high wear numbers.
Is this the origin of the "old oil is better" theory? Someone posted this on the Audi Forum.
"Engine wear actually decreases as oil ages. This has also been substantiated in testing conducted by Ford Motor Co. and ConocoPhillips, and reported in SAE Technical Paper 2003-01-3119. What this means is that compulsive oil changers are actually causing more engine wear than the people who let their engine's oil get some age on it."
"While the wear metals all accumulated steadily over the course of the test, the highest concentrations of accumulation per mile occurred in the first 3,000 miles of the test! From the 3,000-mile mark all the way to 18,000 miles, only lead showed an increase in per-mile wear beyond 3,000 miles. Yet even with an increased wear rate, lead wore the least in terms of absolute wear. For iron and copper, the longer the oil remained in service, the lower the wear rate got.
In case it isn't obvious yet, this means that the most wear occurs in the first 3,000 miles."
"Based on the results we've got here, we'd recommend 8,000 miles between oil changes on an engine that uses no oil at all, perhaps 10,000 miles on an engine that uses some oil, and 15,000 miles or beyond with a filter change every 5,000 miles. This, of course, isn't any kind of guarantee, and you must evaluate for yourself what your engine requires. One thing we're pretty sure about though: 3,000-mile intervals is a huge waste of resources."
A good synthetic like Mobil 1, Valvoline Synpower, or Amsoil would have no problem going 10,000 miles.
Keep in mind that oil filters should be changed at 6-month intervals though (the filtration media tends to start to brake down beyond that point).
quote:"Engine wear actually decreases as oil ages. This has also been substantiated in testing conducted by Ford Motor Co. and ConocoPhillips, and reported in SAE Technical Paper 2003-01-3119. What this means is that compulsive oil changers are actually causing more engine wear than the people who let their engine's oil get some age on it."
This statement apparently is generating a bit of controversy across the internet forums. I saw it posted at an outdoor power equipment site, recognized some of the names/ID's & headed over to BITOG for the search funtion.
More engine wear? Is this opinion based solely on interpretation of the UOA's from this particular test or do more test results & dimensional data support this theory?