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  #16  
Old 06-25-2015, 08:27 AM
Diesel Preferred
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,788
Let's talk $$$. M1 oil change with filter costs me about $50 plus my time. A four pack of oil samples was about $70 last time I bought one. If I can have confidence how the oil is performing in my engine under the conditions that I drive, and I can go to extended drain intervals, I can easily save far more that the $70 cost of the samples and the few dollars for postage to send the samples in.

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/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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  #17  
Old 06-25-2015, 09:32 AM
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 4,393
Quote:
Originally Posted by Maxbumpo View Post
Let's talk $$$. M1 oil change with filter costs me about $50 plus my time. A four pack of oil samples was about $70 last time I bought one. If I can have confidence how the oil is performing in my engine under the conditions that I drive, and I can go to extended drain intervals, I can easily save far more that the $70 cost of the samples and the few dollars for postage to send the samples in.
If it gives you peace of mind, that is the important thing.

I change the oil and filter on my 300D (and other cars) once a year whether it needs it or not. But then none of them get driven more than about 6k miles per year.
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85 300D,72 350SL, 98 E320, Outback 2.5
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  #18  
Old 06-25-2015, 10:21 AM
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Join Date: Sep 2009
Location: Oberlin, OH
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With today's superior oils, I do not see any reason to at least run the vehicle to MB's recommended mileage/time interval. For the '95 E300, I'm going to 7500 miles or one year....whichever comes first.
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-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991
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  #19  
Old 06-25-2015, 10:48 AM
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Join Date: Oct 2012
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Originally Posted by chronometers View Post
With today's superior oils, I do not see any reason to at least run the vehicle to MB's recommended mileage/time interval. For the '95 E300, I'm going to 7500 miles or one year....whichever comes first.
We never talk duty cycles. A lot of highway use versus say ninety five percent of short in town trips. Where contaminates in the oil build up much faster.

Oils do not now or in the past basically wear out I believe. In diesels especially the soot component that accumulates in it is perhaps the most determining factor of practical usage. These short trip cars usually have moisture contamination from condensation also present plus bad acids can develop from this.

People have to just use their own judgement of what they should do. Other than manufactures recommendations or oil testing if going outside the conventional recommended envelope.

Almost any car I can think of should get a fairly frequent run getting the oil hot enough to boil of the condensate at least.

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