Highest Mileage before doing chain guides - BMW M5 Forum and M6 Forums
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post #1 of 29 Old 17th April 2017, 03:00 AM Thread Starter
KRAM5
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Highest Mileage before doing chain guides

Like the title says, I'm curious mileage people have gone without finding plastic in their oil pan, or, everything seems fine with or without checking.

I ask because I just bought one with 140k on it.
Car has no record of new tensioner and makes no noise to indicate it needs replacing.
I have a new lower one in the box and will swap it in anyway.
Car has records of LM 10-60 oil changes every 5k or less over the past 70k miles and is quiet on start-up and makes no rattles or noises that many seem to talk about here.

When I changed the oil after purchase I found the drain plug near stripping.
I bought a lower pan gasket and plan to drop it after I put a couple thousand miles on the fresh oil to see if anything's in the pan while I fix the stripper plug. Hopefully I find nothing, how about the rest of you?

Also if anyone has a link to the correct way of fixing the plug, I appreciate that!
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post #2 of 29 Old 17th April 2017, 04:06 AM
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The S62 isn't really known for having chain guide issues, that's more of an issue with the M62tu in the 540i/740i/X5. Most S62's can get to 200k+ miles on original guides, they're pretty robust motors overall.

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post #3 of 29 Old 17th April 2017, 04:43 AM
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Quote:
Originally Posted by dannyzabolotny View Post
The S62 isn't really known for having chain guide issues.
Danny, I thought it's something we're supposed to be vigilant about ? A quick search shows several threads from those who've expierenced this issue. The most recent here

KRAM5,
Here's some links for the drain plug. Unfortunately, as often the case, many of the pics are no longer available.

DIY -Repair stripped oil pan drain plug

DIY Stripped oil pan drain plug repair - Helicoil method

Fixed my stripped oil pan drain plug with Time Sert and I have question about the torque numbers for the drain plug.

Last edited by Ibmotoren; 17th April 2017 at 06:02 PM. Reason: Changed wording (less alarmist)
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post #4 of 29 Old 17th April 2017, 04:49 AM
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Imo its overblown. Theres thinking that chain tensioners being broken caused a lot of these issues. If you retroactively replace it and check your oil pan for plastic it seems like you should be ok.
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post #5 of 29 Old 17th April 2017, 05:44 PM
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Quote:
Originally Posted by dannyzabolotny View Post
The S62 isn't really known for having chain guide issues, that's more of an issue with the M62tu in the 540i/740i/X5. Most S62's can get to 200k+ miles on original guides, they're pretty robust motors overall.
My 740i m62tu daily driver had broken guides at 112k. I am also curious about my M5. I am pushing 160k miles. Should I be concerned? When looking up the M62tu engine, everyone agrees. But S62 has varying opinions with most leaning towards not to worry about it. Which one is it?
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post #6 of 29 Old 17th April 2017, 05:48 PM
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Quote:
Originally Posted by KRAM5 View Post
Like the title says, I'm curious mileage people have gone without finding plastic in their oil pan, or, everything seems fine with or without checking.

I ask because I just bought one with 140k on it.
Car has no record of new tensioner and makes no noise to indicate it needs replacing.
I have a new lower one in the box and will swap it in anyway.
Car has records of LM 10-60 oil changes every 5k or less over the past 70k miles and is quiet on start-up and makes no rattles or noises that many seem to talk about here.

When I changed the oil after purchase I found the drain plug near stripping.
I bought a lower pan gasket and plan to drop it after I put a couple thousand miles on the fresh oil to see if anything's in the pan while I fix the stripper plug. Hopefully I find nothing, how about the rest of you?

Also if anyone has a link to the correct way of fixing the plug, I appreciate that!
Good quality oil and frequency of oil changes seems to give these guides long life. I have personally seen over 200K on these engines with no guide wear/deterioration indications but those engines have received frequent oil changes 5000K or less and a good quality oil. I think your case the maintenance is there and probably little to worry about. just keep of the measure of maintenance.

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post #7 of 29 Old 17th April 2017, 07:22 PM Thread Starter
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I appreciate all the replies will be doing a time-cert on the pan when I take it off.
My maintenance is on par with most OCD/enthusiasts and I have a tendency to replace too much at times.
Given the amount of work involved and the fact that most guide failures don't ruin valves/heads, I'll be holding off until I have solid proof of need to replace.
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post #8 of 29 Old 17th April 2017, 07:54 PM
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S62 does not run nearly as hot as the M62s. Do an oil anaysis first before opening up the motor. If she isn't making noise, no point in my opinion.

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post #9 of 29 Old 17th April 2017, 10:12 PM
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The lower running temperature, thicker oil weight, and double timing chain all contribute to a much lower rate of chain guide failure in the S62. You have to remember that the guides are physically different in the S62— they're twice as wide and the forces are more evenly distributed with the two main timing chains, hence the lower guide wear.

I'd say the rod bearings are more of an issue with the S62 than the chain guides due to the higher rev limit and thicker oil, but those are largely based on what the owner does. A well-maintained S62 that's allowed to warm up to temperature properly won't have rod bearing issues, whereas an S62 that's redlined on a cold start will have rod bearing issues very quickly.

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post #10 of 29 Old 17th April 2017, 10:49 PM
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Quote:
Originally Posted by KRAM5 View Post
I appreciate all the replies will be doing a time-cert on the pan when I take it off.
My maintenance is on par with most OCD/enthusiasts and I have a tendency to replace too much at times.
Given the amount of work involved and the fact that most guide failures don't ruin valves/heads, I'll be holding off until I have solid proof of need to replace.
If you don't want to mess with the time-cert, I have an exchange pan that is repaired with a SS bushing ready to go. Described around post #44 in this thread. Have a few tweaks since then. Let me know if you are interested.
DIY -Repair stripped oil pan drain plug

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