Manual calls for no more than 15k on valves.  That would be around three years 
for me, but I did it annually.  Pretty good idea I had was to do the brakes, 
trans and valves, but gave up and did valves sooner.  

BioD does tend to seep into the IP, so I would drain the pump every year when I 
did valves and fill with good oil.  By the time I was doing  valves, the 
injector pump was running on BioD and not oil, so it allowed me to keep an eye 
on it, the condition of the cams, and amount of blowby coating the valve cover. 
 Six $$$ for a gasket was worth the price.

clay



On May 29, 2013, at 2:27 PM, Curt Raymond wrote:

> I'm amazed by bio-diesels quieting ability, even just B05 is stunning and the 
> change is quick.
> 
> Historically I've run a quart of motor oil through the engine (by dumping it 
> in the tank) once or twice a year, it also does a lot to quiet a noisy 
> engine. Now that I have easy access to biodiesel (well, it adds a bit to the 
> commute so I do it on Fridays) I'm going that route instead.
> 
> Another thing I've done when I noticed the engine getting rough was to put a 
> full bottle of PowerService Diesel Kleen (the quart bottle) into a 1/4 tank 
> of diesel and run that as far down as I dare. One time I did that it was like 
> new motor mounts in a bottle. I clearly had some crud in the system.
> 
> That said if your valves are more than 30,000 miles they MUST be adjusted 
> before bothering with anything else. I think the factory interval is more 
> like 15,000.
> 
> -Curt
> 
> Date: Wed, 29 May 2013 16:02:03 -0400
> From: Rich Thomas <richthomas79td...@constructivity.net>
> To: Mercedes Discussion List <mercedes@okiebenz.com>
> Subject: Re: [MBZ] where we are headed
> Message-ID: <51a65ebb.3000...@constructivity.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> I think Der Diesel Doktor said injectors were likely to blame -- run 
> some of that stuff through them and see if it quietens?
> 
> --R
> 
> 
> On 5/29/13 3:56 PM, Randy Bennell wrote:
>> 
>> Mine probably does too.
>> I have no real means of comparison as I am the only one I know of 
>> locally who owns one of these old cars.
>> I had a friend with a similar vintage 240D and my recollection of it 
>> is that it was quieter than my car.
>> 
>> So what is the likely reason for a diesel being noisy?
>> I think I have been told it would might help to check the adjustment 
>> on the valves.
>> 
>> 
>> Randy
> 
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