If your driving is pretty regular you don't have to sample for every change.
You pull a couple samples working up to a mileage, like where Max decided 17k
was probably the farthest he could go, then you pull back a little to give a
safety buffer.
My Jetta can probably go 15k easily but 10k makes it easy for me to schedule
changes and I don't have to worry if I end up going over by a couple thousand.
This all reminds me, I need to pull the first sample off the Golf and order oil
and a filter...
-Curt
From: Dan Penoff via Mercedes <mercedes@okiebenz.com>
To: Mercedes List <mercedes@okiebenz.com>
Cc: Dan Penoff <d...@penoff.com>
Sent: Saturday, February 13, 2016 9:03 AM
Subject: Re: [MBZ] Larry T Oil Analyses and Aircraft
Points well taken, Max. On some engines this might be more important than
others, too.
As inexpensive as the oil changes are on our cars, I’m not sure there’s value
in sampling for oil change intervals. If you get 50% more mileage out of an
oil change but spend $20 for an oil sample it’s pretty much a wash, I think.
Of course, you do get the benefit of seeing what’s in the oil as well, as in
the example you give.
I guess it’s a matter of personal preference….
Dan
> On Feb 13, 2016, at 8:51 AM, Meade Dillon via Mercedes
> <mercedes@okiebenz.com> wrote:
>
> The lab that Larry uses reported that one of my samples had coolant in the
> oil. Invisible to eye, the amount was small, but I knew that either the
> head was cracked or the head gasket was failing. I had time to source a
> used head while still driving the car.
>
> I used the soot number over several samples to determine a reasonable
> extended oil change interval. On my '95 E300, when I was driving it, the
> lab results indicate that I could probably go 17k miles before the soot
> load exceeded 2%, so I settled on a 15k mile interval. I need to re-sample
> my '87 wagon which has a new head, and a new injector pump, and determine
> the new oil change interval to keep the soot load below 2%.
>
> I think 2% is the right number, isn't that what Marshall Booth (RIP) always
> used to say?
>
> In addition, you get the wear metal numbers, so you get a very good idea of
> exactly how well your oil is doing. Change oil brand or type, see a change
> good or bad, and know what's going on.
>
> -------------
> Max
> Charleston SC
>
> On Sat, Feb 13, 2016 at 8:28 AM, rogerhga--- via Mercedes <
> mercedes@okiebenz.com> wrote:
>
>> Ok guys, enlighten me please. What value do you gain from an oil analysis?
>> If your engine is worn out, you probably know from the bad starting and
>> lack of power. If it has metal fragments, you would know from the valve
>> chatter or other noise. If you're using the wrong oil, you should know from
>> reading all the debates and info on this list. So, again, what would I gain
>> from an oil analysis?
>>
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