Comprehensive S85 Rod Bearing Picture Thread - Page 5 - BMW M5 Forum and M6 Forums
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post #41 of 757 Old 11th October 2013, 09:56 PM
wingnut1961
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Here's another data point - Attached a few (sorry about the photo quality) pics of rod bearings removed from a salvaged long block out of a 2007 M6 with about 32,000 miles. There was nothing unusual about the maintenance history that I could find.

The main photo shows cylinders 1 thru 10 from left to right, piston side bearing shells are on top, cap side shells on bottom. Wear on top shell was pretty consistent with copper just starting to show in a few. New red/blue BMW bearings went in with Plasti-gage checks showing clearances are in 0.002-0.0025 inch range. Note - brownish spots on some bearings is oil puddling.

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2007 M6 cab, SMG, Sapphire Black, Portland, CA, HUD, CF trim,
Satin black kidneys, CF Lip, LED AEs, RPI scoops, BOPs, BMC filters (charcoal delete),
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post #42 of 757 Old 11th October 2013, 10:29 PM
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Thanks for sharing. We haven't seen a good set yet. Those look worse than mine which were at 50K. Another example of how well TWS is working. NOT.
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post #43 of 757 Old 11th October 2013, 10:39 PM
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I'm at 42k miles, I was thinking on waiting to 50k miles to do this. I'm having second thoughts! My car had 31k miles when I got it (just 2 oil changes per bmw) it was a 1 owner. I'm not worried about the previous owner but the time it spent at the dealer before I bought it ( about 2 months). I know it took a lot of hard test drives and who knows if the oil was up to temp. But this was in Puerto Rico ( hot all the time) any thoughts ?
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post #44 of 757 Old 11th October 2013, 10:53 PM
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I know you'll do it yourself. 600.00 is cheap insurance then you'll know. Get the WPC treatment. I see you have an 06. Put a new vanos line in there but don't remove the vanos pump. Too hard to realign and it doesn't have to be pulled to do bearings.

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post #45 of 757 Old 11th October 2013, 10:56 PM
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Quote:
Originally Posted by PRM5 View Post
I'm at 42k miles, I was thinking on waiting to 50k miles to do this. I'm having second thoughts! My car had 31k miles when I got it (just 2 oil changes per bmw) it was a 1 owner. I'm not worried about the previous owner but the time it spent at the dealer before I bought it ( about 2 months). I know it took a lot of hard test drives and who knows if the oil was up to temp. But this was in Puerto Rico ( hot all the time) any thoughts ?
I'd expect similar looking wear. The pics I posted were from a NY/MD based car. Not warming oil up before "spirited driving", combined with tight clearances seems to be the leading hypothesis on accelerated wear. 10W-60 exacerbates the problem in cold climates. BMW just changed their oil recommendation on the S85 (among others), the first official acknowledgement of an issue IMHO.

I'd can't say what condition your bearings are in and an oil analysis may or may not tell you anything without a full trend history. If it's not knocking, and you carefully warm up, you should be ok for a while, but that's just a guess. Sorry I can't be more helpful than that.

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post #46 of 757 Old 11th October 2013, 10:58 PM
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Quote:
Originally Posted by B767capt View Post
I know you'll do it yourself. 600.00 is cheap insurance then you'll know. Get the WPC treatment. I see you have an 06. Put a new vanos line in there but don't remove the vanos pump. Too hard to realign and it doesn't have to be pulled to do bearings.
Ili probably do it when I store it for the winter in a month or so. You are right I'm doing it myself on jack stands!
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post #47 of 757 Old 11th October 2013, 11:05 PM
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post #48 of 757 Old 12th October 2013, 01:00 AM
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I have an 06 with 75k, it's an Arizona car where it 100 degrees 100+ days a year. I have a theory that the s85 rod bearings in hot climates don't suffer as much oil starvation as the s85 rod bearings in cold climates because the oil will have more viscosity. I'm awaiting my Blackstone report to add some weight to that theory.

Anyone here have worn rod bearing or high lead Blackstone report that lives in a hot climate?


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post #49 of 757 Old 12th October 2013, 02:05 AM Thread Starter
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The hottest climate on earth won't thin TWS enough. Visibility has increased on the rod bearing issue in the last few months. Funny, BMW AG specified more frequent oil change intervals recently. Oh yeah, they recommend thinner oil now too.

If I had an S85 in any climate, any conditions, any number of owners, anywhere in the world, I would change the rod bearings out preventatively and switch to thinner oil. There's enough documentation floating around now that the notion of this being pure speculation is starting to go away. They got our money when we bought the car, they got our money with TWS, now they get more with parts. At least the improved visibility of the subject may save a few engines from here on out.
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post #50 of 757 Old 12th October 2013, 02:06 AM
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I live in Hong Kong weather is hot and humid here and my road bearing were in worst shape that those after only 60000km and I ended up with a failed engine !!

My advice is replace yours ASAP !!
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