Hi Ernest,
In the overall sense of things, the number of people using BioD is still
pretty small. I haven't heard or seen anything about its affect on oil and
oil change intervals - sorry -
Larry T (66 MGB, 74 911, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
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- Original Message -
From: ernest breakfield [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Saturday, May 24, 2008 12:45 PM
Subject: [MBZ] extended oil drain intervals for synthetics used with
BioDiesel (was: Re: Here come the diesels!)
hi Larry!
seen anyone do any comprehensive oil scanning on diesels using
synthetic oils with B100?
i haven't been able to get anything from any of the synthetic
manufacturers about what happens to their products when using BioD;
seems that on one hand, the need to change oil so often in our 617 would
be reduced on the basis of soot buildup (because there basically *isn't*
any), but on the other hand i'm wary about extending drain/fill
intervals because of the increased solvency of BioD and uncertainty of
what it does to the synthetics.
for the last 50K miles i've been using B100, i've been doing 3K
changes while using Delo, because it's pretty obvious that the BioD
breaks down the oil faster than #2.
cheers!
e
LarryT wrote:
We've done a number of TBN (total base number) tests for customers
over
the years and they all seem to say the same thing - the additives that
control the acids created by the combustion process are typically
exhausted
by around 7500 miles. Based on this I generally suggest oil be changed
every 5000 miles or so which allows some safety factor as the TBN can be
depleted at different rates depending on a variety of factors. Of
course,
some customers have special situations which dictate shorter changes.
We have not done many TBN tests lately as the Lab has increased the
price to $20 per tests - which is *my* cost. I should charge customers
$20
plus a reasonable markup but I feel this is extreme and suggest customers
considering TBNs to wait and see what the Oil Sample Report says before
making any decisons.
But I think 3000 mile changes are a waste of money -
Larry T (66 MGB, 74 911, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
800-583-8601
Weber Carb Info http://members.rennlist.com/webercarbs
- Original Message -
From: Alex Chamberlain [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Friday, May 23, 2008 12:46 PM
Subject: Re: [MBZ] Here come the diesels!
On Fri, May 23, 2008 at 9:32 AM, Allan Streib [EMAIL PROTECTED]
wrote:
Go by what the owner's manual says, not the sticker the shop puts in
your window. Those ALL still say 3 months/3000 miles because they
want the extra business.
Chains like Jiffy Lube push the 3K mile change interval really hard,
too. I think the average person probably changes their oil more often
than necessary, and their coolant, brake fluid, and transmission fluid
not often enough.
Alex
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