Seal Failure Question - BMW Luxury Touring Community
 
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post #1 of 7 Old Oct 28th, 2007, 10:33 pm Thread Starter
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Seal Failure Question

I've read a ton of posts regarding synthetic oil, pros & cons, etc, and a few inferred that seal failures may be related (caused by) synthetic oils. Is there any basis for concern? Do the various synthetic oils have different additives that impact seals differently? How may seal failures are attributed to synthetic oil?

I'm looking for a less expensive oil than the BMW 15w50 Synthetic, but concerned that a change may cause seal problems.

Glen
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post #2 of 7 Old Oct 28th, 2007, 10:50 pm
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I have heard the same thing and have myself experienced several seal failures about 10K after changing to synthetic oil. But I also suspect lack of use for two years prior to my purchase of the bike. Plus seal failures on the LT is relatively common.

If I had it to do over again, I am not sure I would switch to synthetic. My recommendation is to evalutation why you actually want to switch..

I am really not sure there are real tangible benefits since BMW has an oil change interval of 6K on the LT. If you change oil more frequently, you may be just throwing money away if you switch.
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post #3 of 7 Old Oct 29th, 2007, 2:05 am
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Most "seal failures" (in cars) after switching to synthetics is attributed to the detergents used in them. The seal leaks were already there but the sludge /paraffin build up from regular dino oil has sealed them up. Along comes the synthetics and cleans that all out and now the leak can be found. Switching from one synthetic to another brand should pose no problems at all.
The "reason" for switching to synthetic is a simple matter of reduced friction and greater durability they offer.
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post #4 of 7 Old Oct 29th, 2007, 5:41 am
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Quote:
Originally Posted by Morley
Most "seal failures" (in cars) after switching to synthetics is attributed to the detergents used in them. The seal leaks were already there but the sludge /paraffin build up from regular dino oil has sealed them up. Along comes the synthetics and cleans that all out and now the leak can be found. Switching from one synthetic to another brand should pose no problems at all.
The "reason" for switching to synthetic is a simple matter of reduced friction and greater durability they offer.
I can see this being true on seals that have many, many miles on them. But, in my case, I switched at 19K and within 10K I had leaks. It was recommended to me that I switch at 18K or beyond. At short oil change intervals (roughly 3K with dyno oil), I doubt there would be very much build up at all with such a low mileage count.

These engines are designed to last for multiple hundreds of thousands of miles.

I doubt that switching between different "TRUE" synthetic oils would make much difference though.
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post #5 of 7 Old Oct 29th, 2007, 6:37 am
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Seal Failure

FWIW, I changed to Amsoil synthetics at about 18000 miles. No seal failures so far at 29000.

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post #6 of 7 Old Oct 29th, 2007, 9:26 am
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Quote:
Originally Posted by UltraLT
FWIW, I changed to Amsoil synthetics at about 18000 miles. No seal failures so far at 29000.

Ultra LT
Good... Glad to hear it. I suspect my contributing factor was the bike had sat for almost 2 years by the previous owner that should never had purchased the bike in the first place.

My main seal, input/output shaft seals were toast at 28K.. That 28K went on in 2 years. I am concerned that other seals will be failing. But, I can only take it day by day.
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post #7 of 7 Old Oct 30th, 2007, 9:05 am Thread Starter
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Thank you all for your replies. One can never have too much info. Thanks again.

Glen
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