Re: bmw-digest V9 #445--Oil additives

["Anthony Penzinski / ¦w±e¥¿" <theskunk@xxxxxxxxxx>]

There's an excellent tech article regarding oil additives by Fred Rau in the August 1992
issue of ROAD RIDER magazine. BMW Motorcycles of Santa Cruz has it posted in the tech
section on their website. Go to: http://www.bmwscruz.com/tech/tech003.html
Cheers!
Anthony Penzinski
The Skunk Works
Taizhong City
Taiwan ROC
'every day a wrenching experience'


> Date: Thu, 5 Nov 1998 22:49:20 -0500
> From: Dave Ream <dream@domain.elided>
> Subject: Re: Frame TEflon oil filter
>
> Randy,
>
> I'd say DON'T mess with Teflon. IMHO it won't help much if at all, and it
> could cause damage.
>
> Why no Teflon? Well, because turbocharged motors put a greater heat loading
> on the motor oil, and Teflon does not do well at high temperatures. From
> what I hear, it can break down at high temperatures and transform into
> stuff that is not good for the engine. I don't know how high must the
> temperatures be, BUT; remember that the oil not only lubricates the turbo
> bearing, it cools the bearing. The bearing is integrally connected to the
> exhaust turbine of the turbocharger, which gets *very* hot (someone who
> knows numbers, feel free to chime in).
>
> To give you an intuitive idea of how hot, after about 60 seconds or more of
> sustained boost the cast iron housing of the turbocharger in my Saab 900
> Turbo turns a nice cherry red that lights up the engine bay at night. So,
> change the oil often (when it starts to smell scorched, for example :]  )
> and enjoy your turbocharger.
>
> Just change your oil & filter regularly (e.g. 3,000 miles), let the car
> idle for 20-30 seconds when you first start it up before revving the engine
> to ensure the turbo bearing has adequate oil pressure before the turbine
> winds up, and let it idle for about 30 seconds before shutting off the
> engine after using the turbo (to let the turbine wind down before the oil
> pressure goes away and to cool the bearing and housing), and you should be
> fine.
>
> FYI, HP Books publishes a book on turbocharging by Hugh MacInnes (sp?) that
> is a classic, and is available from www.Amazon.com
>
> In addition, the bmw-digest V7 #1761 had some good postings about motor
> oils, which may shed additional insight into how to keep your turbo happy.
> When I read it I saw some clues perhaps as to why Saab recommends 10W30
> instead of 10W40 for my car.
>
> Dave Ream
> '88 Saab 900 Turbo
> (I know, it's not a BMW, but hopefully it's replacement will be!)
>
> P.S. Seems to me Slick 50 was paying substantial amounts of money recently
> to settle a class-action lawsuit regarding their Teflon-laden product...
>
> >Date: Thu, 05 Nov 1998 10:51:47 -0700
> >From: "Randy Little" <rlittle@domain.elided>
> >Subject: Frame TEflon oil filter
> >
> >Has anyone used the Frame Teflon oil filter?  I have once a long time ago.
> >I was hoping this would help my Turbo have a longer life. Or is is just more
> >snake oil?
> >
> >
> >
> >Randy Little
> >320is Callaway

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End of bmw-digest V9 #446
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