On Sat, 24 Nov 2007 14:11:07 GMT, Jeff <kidsdoc2000@[EMAIL PROTECTED]
>
wrote:
>Doc wrote:
>> There seem to be two camps. I've seen those that advocate stomping on
>> the engine to high revs and backing off in the initial break-in
>> because of some alleged benefit.
>>
>> Then there's a more traditional school of thought, such as this post:
>>
>>
>>
http://groups.google.com/group/alt.autos.toyota/msg/fbdecfe9b55b6830?dmode=source
>>
>> Both claim scientific reasons for their method.
>
>What scientific reasons?
>
>Conjecture is more like it.
>
>There are no studies offered to back up the claims made in the post.
>
>> It seems the "flog
>> the engine" guys say to change the oil soon after an initial run
>> period of say 20 miles to get rid of initial metal particles, the
>> above quoted appears to say those metal particles are beneficial.
>>
>> Any thoughts? Real world tests of engines broken in one way vs another?
>
>Such real-world tests, unless done with the proper controls and done
>with several trials would be anecdotes. The plural of anecdotes is not
data.
>
>The best advice would be to follow the break-in procedures recommended
>by the vehicle manufacturer, the people who know the engines the best,
>and the people who employ people with real expertise.
>
>Jeff
Jeff make some good points. I have never seen any real-world,
double-blind studies examining this topic. Common sense would seem to
indicate that, with today's close manufacturing tolerances, an
extended break-in is unnecessary. But even with close manufacturing
tolerances, there are still going to be high and low spots on the
cylinder walls, ring diameters, bearing surfaces, etc. that will have
to mate in with their corresponding surfaces. This will take time and
will result in higher wear products than will show up later in the
life of the engine.
All I can do is tell you what I do with a new engine:
I drive it easily for the first 500 miles and very the engine rpm's
within reason (I don't lug the engine at low rpm's, neither do I hit
red line).
After the first 500 miles, I will run the engine up to red line, at
full throttle for brief intervals. I hold it at high rpm for just a
moment then ease off to normal engine speed.
I change the oil and filter after about 1000 miles using a name-brand
multigrade conventional oil with the weight recommended by the
manufacturer.
After the first 1000 miles, I drive normally. The second oil and
filter change is at about 3000 miles. The rest are about every 4000
to 5000 miles. I use name-brand, multiweight, conventional oils and
name brand filters, no house brand oils or filters for my cars.
This has resulted in engines with will over 100,000 miles that don't
use more than a quart of oil between changes. It works for me so I
don't see any reason to change.
Jack
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