Edd, I agree with Steve and Marek. Synthetic oil is a waste in our boats. 
That being said the enginrs do require to be run at cruise power 75% of max rpm 
for about an hour at least once a month if it is used for weekend sailing. I 
had to replace my injectors because the PO always ran the engine too slow. He 
was "saving the engine". Our boats have converted tractor engines, which are 
designed to operate at 75% max speed all day long. I run my 3qm30 at 2k to 2100 
with over 3k hours no smoke or starting issues. I hope this helps some. 
Doug MountjoysvPegasusLF38 just west of Ballard, WA.    


------ Original message------From: Marek Dziedzic via CnC-ListDate: Mon, May 
25, 2015 09:13To: cnc-list@cnc-list.com;Cc: Marek Dziedzic;Subject:Re: 
Stus-List Darker Smoke, Harder to StartMy experience with synthetics (not with 
diesels, though) is that if you use it from start, that’s great, but if you try 
using the synthetics on an older engine, you are quite likely going to dissolve 
some of the deposits already there and suddenly, you may find that you are 
burning or losing the oil (some seals don’t seal as they used to). Not to 
mention that our engines are never really stressed enough to justify the higher 
cost. And most of us don’t try starting these engines in subfreezing 
temperatures. So the extra temperature range that synthetics offer don’t buy us 
much. But I am not the expert on oils. Marek From: Fred Hazzard via CnC-List 
Sent: Monday, May 25, 2015 11:03 AMTo: cnc-list@cnc-list.com Cc: Fred Hazzard 
Subject: Re: Stus-List Darker Smoke, Harder to Start What do the experts say 
about synthetic oil in diesels?Fred Hazzard
S/V Fury
C&C 44
Portland, OrOn May 25, 2015 7:10 AM, "Marek Dziedzic via CnC-List" 
<cnc-list@cnc-list.com> wrote:
        most of the engine oils that are available today have plenty of 
additives   that get bad or ineffective after about 6 month in the engine. So 
if you are   using the engine year round, you might consider changing the oil 
twice a year   (at least once a year) and if you are using it less (even if you 
use it for   just a few hours each year), change it annually. For us, Northern 
folks, this   usually mean changing it in the fall. From what I read around, 
there are   people who change the oil in the fall and again in the spring. I 
don’t, but I   can understand the reasoning behind it.     I hate throwing out 
the good engine oil after some 25-50 h of running   time, but this is a cheap 
insurance for the engine.     Marek  1994 C270, Legato  Ottawa, on           
From: Sam Salter via CnC-List     Sent: Sunday, May 24, 2015 9:11 PM  To: Jim 
Watts via CnC-List ;   1 CnC List   Cc: sam.c.sal...@gmail.com     Subject: Re: 
Stus-List Darker Smoke, Harder to   Start       Diesel   engine oil is supposed 
to look black - it's like that a half hour after you   start the engine - by 
design.     sam   :-)                                From: Jim Watts via 
CnC-List        Sent: Sunday, May 24, 2015 6:48 PM        To: 1 CnC List        
Reply To: cnc-list@cnc-list.com        Cc: Jim Watts        Subject: Re: 
Stus-List Darker Smoke, Harder to         Start         It's black. 
         Jim Watts
Paradigm Shift
C&C 35 Mk III
Victoria,   BC
     On 24 May 2015 at 16:59, Sam Salter via CnC-List <cnc-list@cnc-list.com> 
wrote:
          What     does bad lubrication oil look like?         sam     :-)      
                                      From: S Thomas via CnC-List          
Sent: Sunday, May 24, 2015 5:01 PM          To: cnc-list@cnc-list.com          
Reply To: cnc-list@cnc-list.com          Cc: S Thomas          Subject: Re: 
Stus-List Darker Smoke, Harder to           Start                         If it 
is cranking at the usual speed, then the     compression might be off a bit in 
one of the cylinders. This can happen if     one of the piston rings has got 
stuck over the winter. I would warm up the     engine good and hot and then 
take for a run. Run it fairly hard for a couple     of hours so long as 
everything appears to be ok. That should get the carbon     out, if there is 
any, and it might loosen up a seized ring.          Black smoke is a sign of a 
rich mix, but it     means little if you have just started the engine after a 
period of cranking     it for a while.          If you did not change the oil 
last fall, then     now is the time to change it. I don't know why, but I have 
found that     lubricating oil sitting for a while in diesel engines is more 
likely to go     bad than in gasoline engines. Maybe it is climate dependent, 
but that has     been my experience limited though that may be.           Steve 
Thomas    C&C27 MKIII    Port Stanley, ON           ----- Original Message 
-----       From: Edd Schillay via CnC-List       To: cnc-list Cnc-List         
    Cc: Edd Schillay       Sent: Sunday, May 24, 2015 18:07      Subject: 
Stus-List Darker Smoke,       Harder to Start             Listers,             
I find I'm having a harder time getting the engine started and seeing       a 
little bit of darker smoke when it does turn over, as compared to last       
season.              Once running, everything seems fine -- temperature, water 
flow,       revolutions, etc.              Any ideas or suggestions?            
 Usually, my solution to engine problems is "get the jib out."

             All the best,             Edd             
-------------------------------      Edd M. Schillay      Starship Enterprise   
   NCC-1701-B      C&C 37+ | City Island, NY      www.StarshipSailing.com      
-------------------------------      914.332.4400  | Office      914.774.9767  
| Mobile      -------------------------------      Sent via iPhone 6      
iPhone. iTypos. iApologize            
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