For the most part large displacement stationary diesels have nothing more than 
banks of large spin on or cartridge type filters, much like you would find on 
your car engine. They're just larger and often in multiples in order to provide 
a larger filter area for the much larger oil volume.

Some prime power stationary diesels can have centrifugal filters as well. These 
are literally centrifuges that spin the oil at very high RPMs in order to 
remove particulates.

There are also particulate traps installed on the exhaust, but when I was still 
in the business these were in their infancy. They weren't very efficient and 
required frequent service.


Sent from my iPad

> On Jul 16, 2014, at 8:52 PM, Scott Ritchey via Mercedes 
> <> wrote:
> It is my understanding that BIG Diesels have additional filtering that
> removes soot from the oil but these soot filters are not cost-effective for
> our little automotive Diesels.  Obviously, a worn Diesel will allow a lot
> more soot to get in the oil so maybe sampling would allow extended change
> intervals for a new tight engine.  My one remaining Diesel car may have a
> tight engine but it is far from new and my use of that car is inconsistent.
> So I change by miles or calendar (annual), whichever comes first, and skip
> sampling.  If I drove a lot of miles on that car I might have a different
> strategy.
> Scott
>> -----Original Message-----
>> From: Mercedes [] On Behalf Of Dan
>> Penoff via Mercedes
>> Sent: Wednesday, July 16, 2014 6:40 PM
>> To: Mercedes Discussion List
>> Subject: Re: [MBZ] Mobil 1 $23 at Wally World
>>>> On Jul 16, 2014, at 5:38 PM, Curt Raymond via Mercedes
>>> <> wrote:
>>> Is the lack of analysis on stationary engines a factor of short run
>> times?
>> Mostly. Because of the typical short cycle times, the oil is often
>> contaminated by condensation in the engine. This is exacerbated by the
>> engines rarely being run under load, and even then the load is fairly
>> small.  It's not uncommon to find the waxy white deposits in the bottom of
>> the crankcase in these engines due to their not getting hot enough to boil
>> off moisture in the crankcase.
>>> Caterpillar has a super aggressive program of analysis that helps them
>> keep machines running for way longer than ever before and lowers
>> maintenance costs by allowing fluids to run longer. If I had an engine
>> with a sump that held 100 gallons you bet I'd want to get all I could out
>> of that oil, changing it early would be crazy talk compared to running a
>> $20 analysis...


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