Re: Synthetic(revisited)

["I.Mannix" <mannix@privatei.com>]

>>SCIROCCO87@aol.com wrote:
>>>
>>> Second, Please correct me if any of you know different, but, I was told
>>>by a
>>> Synthetic oil salesman (and a good friend of my father's) NOT to put synth
>>> oil in any car with over 10k miles unless I was going to replace all oil
>>> seals/gaskets.
>>
>>Oh.  I guess I'd heard it shouldn't be put in older cars but I didn't think
>>that "over 10k miles" was considered old.  If that's the case then I should
>>expect more problems since my engine already has 26k miles on it already.
>>Darn it, and I was hoping to get 100k out this engine!
>
>Here's what I know/have heard about the synthetic--->old engine thing.
>Basically, over time, dirty deposits build up around/in gaskets, and the
>added detergency of synthetic helps wash this crap out, creating leaks -
>the dirt was actually helping seal the engine.  I have also read stuff
>from manufacturers of synthetic lubricants that specifically address this
>problem, and they (Mobil & Redline) say that they have "reformulated"
>their oils so this is not a problem anymore.  Hmm.  I know a few people
>that have put synthetics into old (not 10k, but 100+k) engines without
>problems - I also remember people doing the same 10 years ago with Mobil1,
>and had bad leakage problems - the problem most definetly DID exist, but
>may not anymore.  Based on how long VW engines run, I personally do not
>think the possible leaks to be worth changing to synthetic.  IMHO.  I use
>Castrol oils, been very happy with them.  If only the oil pan/valve cover
>were to leak, big deal - they are easy enough to change - it is seals like
>the rear main seal that worry me - I'd hate to change my oil to prompt a
>clutch change.  I did, FWIW, change to Redline synthetic in my
>transmission a year or so ago, and very soon after (3 weeks?), one of the
>seals behind my CV joints let go, destroying the CV in the process.  The
>transmission has new seals, and Amsoil in it now - no leaks.  I don't know
>why the CV seal let go, but it did - was it the synthetic?  Maybe, it was
>not leaking prior to the change.  It is an old car, though - who knows.
>
>
>As to putting synthetic into an engine with 10 thousand miles in it, well,
>I don't see that being a problem.  I'd put it into an engine with anything
>less than roughly 80k on it, personally - don't know how I came up with
>that number, but that's what I'd do.  I know several people with new
>engines who used the factory recommended changes up until they were no
>longer free, then went to synthetic - maybe 30k?  No problems I am aware
>of.  If a clutch job were upcoming, well, I'd probably consider it - it
>might make the clutch change a bit sooner, but you're going to replace the
>seals while in there, right?  I might change over when I do my next
>clutch, who knows.  Just some thoughts.
>
>
>Mannix
>
>
>>
>>> SO, my advice is that
>>> you should not follow  Shad's lead in order to "clean" your block.  I think
>>> his car will need a lot more work soon...ie mainseal splashing all over
>>> clutch etc... Happy driving.
>>
>>I'll let you know if anything happens when the engines turns 50k miles.
>>Thanks for the "watch out" info.
>>
>>
>>	shadrach
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>
>


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