Please Explain to me how changing the oil, increases wear for the next 1,000 miles
- Thread starter TimeFlies
- Start date
Please explain to us where you heard such a thing.
Don't read unqualified misinformation
Haven’t heard that one.
Patman
Staff member
It’s not misinformation. There is a study out there about this which I’m sure someone will post pretty soon
How does one identify unqualified misinformation without reading it?
So, after 5k to 7.5l miles or so, the oil is getting saturated with wear metals, dirt, etc. When you drain the old oil some of that metal and dirt is left behind. Then you do an UOA after 500 or 1,000 miles and that leftover metal and dirt is now suspended. Therefore, the UOA is pretty meaningless.
Thank you for bringing the subject up.
Thank you for bringing the subject up.
Link to one of many previous threads:
https://bobistheoilguy.com/forums/threads/can-too-frequent-oil-changes-be-bad.378247/#post-6758781
https://bobistheoilguy.com/forums/threads/can-too-frequent-oil-changes-be-bad.378247/#post-6758781
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Patman
Staff member
Mechanics are not tribologists. Most of them honestly don’t have the technical knowledge about motor oil. Nowadays a lot of them can’t even properly diagnose a tough problem. They just replace parts.
Automotive air filters do better after an initial layer of dirt forms.
I believe this phenomenon was conceptually applied to newly-in-service oil filters.
Also, the old practice of including 2 Tablespoons of ash tray sand to fresh oil may have lead many to believe the notion behind the OP's
query.
I believe this phenomenon was conceptually applied to newly-in-service oil filters.
Also, the old practice of including 2 Tablespoons of ash tray sand to fresh oil may have lead many to believe the notion behind the OP's
query.
I do recall a video by Lake Speed Jr once said when you change from one brand of oil to another there was some type of issue. I think something about the additives clashing. I would tend to dispute this as I had 2 fords a 90 Tbird and 96 Explorer both purchased new and went over 200k miles without burning and oil with 3k-5k oil changes with whatever was on sale. I remember using Penziol, Texaco, quaker state and Valvoline just to name a few.
New oil cleans better and can dislodge stuff that settled during the previous oil change interval.
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Eons ago I recall someone doing this on a Camaro... ran oil for 15k but sampled & UOA every 1k. LS motor running Mobil 1 if memory is working. Spike in wear metals after oil change? actually I think the ppm increase at each sample time was less with miles. If there was 10ppm after 1k, it was like 15ppm at 2k, 17ppm at 3k, 18ppm at 4k, 19ppm at 5k, something like that.
Not even sure where I'd look to find that. Dim recesses of the mind, more than a decade ago.
Something about it takes heat and pressure to activate the additives. But ultimately it was ppm level of findings, not "it's sandpaper in the engine for the first 1,000 miles after each oil change, so change as little as possible".
The study was done by BITOG member 3 Mad Ponchos, alas, the old website no longer exists and I couldn't find any recent version in Internet Archive either. Maybe someone saved it locally?
https://bobistheoilguy.com/forums/threads/amsoil-winding-down-what-next.50544/
Read up on tribofilms and how they are formed. Should help you understand.