[W126 Coupe] Engine oil

[eurotech1 at charter.net]

Well,

  We had a '99 BMW 740i in the shop for a smoking problem.Usually, this problem is caused by a diaphragm on the back of the intake that often fails, and allows the engine to suck in oil from the crankcase breather. In this case, it didn't cure the problem. To make a long story short, we found the engine full of sludge, the oil seperator canister behind the timing cover was stopped up, and oil couldn't drain back into the oil pan. So it was backing up into the crankcase breather tube, and draining into the intake manifold, and causing the car to smoke. They have used Mobil One since new, at 10,000 mile change intervals. The car has 82,000 miles. We cleaned out the motor, and replaced the seperator canister, and recommended 3,000 mile change intervals. I have always used Castrol GTX at 3,000 mile change intervals in all of my own cars, and have NEVER, in 27 years of driving, and 54 vehicles I have owned, had an oil related problem.

                 Christopher Huffine

-----------------------------------------------------------
> From: myhog at surfeu.de
> Date: 2005/01/26 Wed PM 12:32:34 EST
> To: mbcoupes at mbcoupes.com
> Subject: [W126 Coupe] Engine oil
> 
> 
> Ah the oil thread.  Seen this on so many vehicle sites it is scary.  On
> the Harley site we actually had a guy who worked for some chemical testing
> lab and here was the skinny from him and confirmed from several manufacturesa..
> 
> When breaking in a rebuilt or new engine... run Mineral oil until broke
> in.. this helps cam/lifter and pistonring/bore seating and will prolong
> the life of the engine..  after that Syn is a better oil but most minerals
> now days are good also.
> 
> Changing from Mineral to Synth.. no problemo!!!
> Changing from Synth to Mineral, difference of opinion from most, a definite
> nono if the synth contains graphite!!!!
> Mixing oils.. should be avoided but can be used until next change.
> 
> Changing intervals... all agreed that under 7000 miles you are wasting your
> money!..
>  most stated that with Synths change the filer and get 10000-12000 between
> changes.
> 
> TYpes...  all had their opinions.. the chemist and consumer reports said
> that mineral oils, the cheapest are just as good as the best with the same
> ratings... Wal Mart brand scored REALLY high..better then the brand names...
> 
> The synths are all about the same with Mobile 1 scoring at the top..
> 
> That was from many expert sources and took several months to compile.. of
> course i briefed it for you all it was like 100 pages after compiled...
> 
> Just my bit
> *down off soap box*
> Kevin
> '91 500 SEC in Germany
> 
> 
> 
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