Peter, the 10w-40 did not have the ash content required by the VW diesel 
engine. At least that was what I was told. That was also 25 years ago. 


Sent from my T-Mobile 4G LTE DeviceDoug Mountjoy POYC Pegasus Lf38 
-------- Original message --------From: PETER OCAMPO via CnC-List 
<cnc-list@cnc-list.com> Date: 7/24/17  10:31  (GMT-08:00) To: 
cnc-list@cnc-list.com Cc: PETER OCAMPO <bcwwka...@gmail.com> Subject: Re: 
Stus-List synthetic oil 
Question  why would changing from 10w30 to 15w40. Destroy a Diesel vw engine?
My westerbeke 33 owner Manuel says 10w30 but previous owner had 15w40.  Should 
I go back to 10w30?   
Thanks
PeterGoonie island C&c 40 Portland me 

Sent from my iPhone
On Jul 24, 2017, at 1:15 PM, Ronald B. Frerker via CnC-List 
<cnc-list@cnc-list.com> wrote:

A couple of mechanics have told me this as well.  If an older car has been 
using non-synthetic, then never change to synthetic since it might start leaks 
that didn't exist before.That said, most of our diesels never get the hours on 
the engine that an auto/truck get so it might be a moot point.RonWild CheriC&C 
30-1STL


       From: Marek Dziedzic via CnC-List <cnc-list@cnc-list.com>
 To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> 
Cc: Marek Dziedzic <dziedzi...@hotmail.com>
 Sent: Sunday, July 23, 2017 6:10 PM
 Subject: Re: Stus-List synthetic oil
   
Mike,

There are some reports that synthetic oil may dissolve some of the residues 
left on different parts, which may lead to sudden increase of the oil usage. Of 
course, this applies to older engines. The general rule of thumb is that if you 
used non-synthetic oils in the past (and did it for years) you may want to stay 
with the same kind. If you used synthetics, there should be no issue switching 
to non-synthetic.

My personal experience is limited to a single car in the past, where I changed 
from normal to synthetic (the car was driven hard) and I ended up with an 
engine that burned about 1-1.5 l (1-2 qt.) of oil for 1000 km.

I don't believe that you could use oil that is "too good" for the engine. As 
long as it is the same grade, it should work fine.

In your case I would monitor how much oil is staying in the engine (and how 
much you burn).

Good luck

Marek
1994 C270 "Legato"
Ottawa, ON

-----Original Message-----
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Hoyt, Mike 
via CnC-List
Sent: Sunday, July 23, 2017 11:45
To: cnc-list@cnc-list.com
Cc: Hoyt, Mike <mike.h...@impgroup.com>
Subject: Stus-List synthetic oil

I had my brother pick up 15w40 for me last week. Changed oil today and when old 
oil drained realized he bought synthetic 15w40. Have outing today and no time 
to get regular oil. 

Plan to drain and change later this week to non synthetic

Is this an issue?

Yanmar 3gm30f
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_______________________________________________

This list is supported by the generous donations of our members. If you wish to 
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    _______________________________________________

This list is supported by the generous donations of our members. If you wish to 
make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

All Contributions are greatly appreciated!
_______________________________________________

This list is supported by the generous donations of our members. If you wish to 
make a contribution to offset our costs, please go to:  
https://www.paypal.me/stumurray

All Contributions are greatly appreciated!

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