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      10-21-2014, 10:37 AM   #463
pbonsalb
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I just replaced the bearings on my 08M3 with 60k using WPC treated bearings and am using Mobil 1 0W40 oil for street use. My 60k mile stock bearings had some premature wear but I think they still had life left in them. I do not plan to worry for another 60k or 6 years at the rate I drive. By then hopefully there will be some reports of WPC bearings being inspected after accumulating some miles and we will have an idea how they are working. Based on that, I will decide to change them again or leave them. Might also be higher clearance bearings available then.

If changing bearings as preventative maintenance is not something you want to consider, sell the car and buy a car that does not have this concern.
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      10-21-2014, 07:57 PM   #464
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Curios... Are the wpc bearings you guys provide come from a stock of part numbers that allow for the best possible clearance?

If not do you guys measure out the clearance once on the car and mix and match to allow for the most clearance?

It is it a random set of wpc bearings?

Reason I ask is that in another post, Dinan stated in their stroker builds that they use the OE bearings. But they mix and match different oe bearings until they get there in house spec bearing clearances for their stroker builds.

My 08 has 70,000 miles on it. So far my blackstone reports are excellent and no funny sounds. If I already have a set that allows the most possible clearance, I don't want to replace with a set that has less clearance.
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      10-26-2014, 11:44 AM   #465
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The wear on those bearings looks like text book detonation.

Bearings should never "wear" in normal use, the oil wedge should always keep the bearing from ever touching the journal, it's only in cases where the oil film breaks down due to oil dilution or cylinder pressure spikes that the bearing is damaged by rubbing the journal.

What you guys are seeing in these motors is not going to be fixed by a few tenths of moly sprayed onto a bearing. Those coated bearings are sacrificial, we use them on race motors to keep the motor from grenading in the second or two it takes the driver to get it shut down in case of an oil system failure. Once that failure has occurred, the motor is disassembled and the bearings are replaced because it's known that they will be worn at that point.

In a motor which is maintained and running properly I can take it apart after several seasons of racing, or in the case of street motors, 50K miles and the bearings should look like the day they were installed....most oem motors these days have such good oil systems and tunes that the bearings look like new past 100K easy.
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      10-26-2014, 12:40 PM   #466
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In around another year or so we will start to see engines with the wpc treated bearings getting cracked open and we will see how they hold up. No its not a fix would need to mill down the crank for that like the guys who build the 1000hp m3 race motors do.
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      10-28-2014, 07:19 PM   #467
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2008 BMW M5, 91,XXX mi

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Vehicle: 2008 BMW M5, SMG
Oil Used: TWS Motorsport 10W-60, 7500mi intervals
Mileage: 91,XXX mi
Fuel: 91 Oct
Driving Habits: Mostly highway driving, no track use
Oil Analysis: None provided



Notes:
This particular M5 was fully serviced under scheduled maintenance and meticulously followed thereafter with oil changes every 7500mi.

Our first M5 bearing swap being performed as a preventive measure, no oil samples have been analyzed prior to teardown. A sample has been collected and will be provided to Blackstone for analysis.

Bearings were replaced with WPC Treated bearings, ARP bolts.
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Last edited by tom @ eas; 10-28-2014 at 08:38 PM.. Reason: typos
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      10-28-2014, 07:23 PM   #468
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Wow!!
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      10-28-2014, 07:32 PM   #469
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Nothing to see here folks, move along

As always thanks for the write up EAS
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      10-28-2014, 07:33 PM   #470
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That is definitely pretty bad.
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      10-28-2014, 08:05 PM   #471
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Simple internet hysteria
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      10-28-2014, 09:22 PM   #472
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Yeah don't feel the troll :roll eyes: that car has another 100K in it.

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      10-28-2014, 09:52 PM   #473
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Hmm more even looking wear on the s85 (still bad) but a noticeable pattern.
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      10-28-2014, 10:19 PM   #474
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Anyone ever received a feedback or comment from BMW on these freaking bearings? Its clear that they have replaced a good number of at least S65 engines at this point and I'd assume have had complains/requests filed by folks who changed themself. What is their story? Complete silence..?
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      10-29-2014, 03:11 AM   #475
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Quote:
Originally Posted by StealYourFace View Post
Hmm more even looking wear on the s85 (still bad) but a noticeable pattern.
Yeah its interesting..had a quick look round the S85 forum and their rod bearing wear pattern is much more even that the S65. Maybe more lubrication related than clearance?

Last edited by SenorFunkyPants; 10-29-2014 at 03:28 AM..
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      10-29-2014, 06:02 AM   #476
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Maybe the engines are all older so the wear is even worse?
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      10-29-2014, 08:53 AM   #477
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Has anyone proactively replaced them and saw no premature wear? That's what I would like to know because it looks like the ones who have posted doing this still shows premature wear. So far it seems we do have a problem, wether or not grenaded. I will get mine replaced when I hit 50k for peace of mind...at worst it grenades under warranty.
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      10-29-2014, 09:04 AM   #478
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I would say all of my lowers were OK and half of my uppers. The half of my uppers that had what I call premature wear look comparable to the worst of the lowers of the S85 bearings posted above. I have little doubt about what would have happened eventually, but my 08M3 with 60k was in no imminent danger of failure and probably would have been fine for a few more years.
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      10-29-2014, 09:26 AM   #479
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Quote:
Originally Posted by JRV View Post
Has anyone proactively replaced them and saw no premature wear? That's what I would like to know because it looks like the ones who have posted doing this still shows premature wear. So far it seems we do have a problem, wether or not grenaded. I will get mine replaced when I hit 50k for peace of mind...at worst it grenades under warranty.
I replaced mine at 77k miles. I did show a spec here and there in the filter which appeared to be lead. I tore the motor down just be safe and see the bearing condition. There was visible wear.

Search my username for my post.

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      10-29-2014, 10:03 AM   #480
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Quote:
Originally Posted by gatty1303 View Post
Simple internet hysteria
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      10-29-2014, 10:43 AM   #481
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Kinda what I was eluding to in my last post in this thread. No one has torn an S65 down with promising looking bearings. How is this internet hysteria?
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      10-29-2014, 04:07 PM   #482
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This is just like the E46 subframe issue. BMW knows this is a problem but doesn't care because the majority of these engines will run past 100k miles without failure. Once you are out of warranty, once they no longer have to foot the bill, they do not care what happens to you. This is why they didn't change the bottom end when they went from S85 to S65. It was "good enough" and BMW would prefer you to buy a new M3/M4 anyway.
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      10-31-2014, 03:52 AM   #483
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Quote:
Originally Posted by JRV View Post
Has anyone proactively replaced them and saw no premature wear? That's what I would like to know because it looks like the ones who have posted doing this still shows premature wear. So far it seems we do have a problem, wether or not grenaded. I will get mine replaced when I hit 50k for peace of mind...at worst it grenades under warranty.
+stock and untracked. I.e. a most conservative baseline to prove there is no issue - if there is indeed no issue

Last edited by crypticc; 10-31-2014 at 04:05 AM..
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      11-01-2014, 07:24 PM   #484
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What would be typical sign or symptoms of bad rod bearing in early phase?
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