[AT] Synthetic Oil

Mon Nov 14 19:51:51 PST 2016

Steve,

I finally got an engine monitor on my EcoDiesel that runs from the OBD port. It shows turbo inlet air temperature. I try to remember to get it below 400 F before I shut it down, but sometimes I am in a hurry and miss the cool down. It sometimes takes 2 minutes to get down below 400 F when I come off of the highway. If it is just a short drive down the street between house and toy shed, it takes a minute or less.

Wish I had some better target numbers for what turbo inlet temperatures should be under various conditions. With my foot in it, I can easily go over 1000 F, but I try not to do that. Without the monitor you have no clue what the temps are. Highway cruising on level ground runs 500 to 800 F depending on speed, etc. If anyone has some idea of normal temps I would be interested in seeing them.

With 11 liters of oil, I am not seeing any quick change in oil temperature.

Dennis

Sent from my iPad

> On Nov 14, 2016, at 7:59 PM, Stephen Offiler <soffiler at gmail.com> wrote:
> 
> Gil, I agree with what Henry said.  Modern turbos used on small engines
> (gasoline and diesel alike) are engineered for minimal "turbo lag" meaning
> they spin up quickly.  The flip side is that they also spin down quickly.
> Add modern oils and modern bearing materials, and the manufacturers offer 5
> year/60K mile and on up to 7 year/100K mile powertrain warranties with not
> a whisper in the owner's manual about special shutdown procedures.
> 
> SO
> 
> 
>> On Mon, Nov 14, 2016 at 7:10 PM, Henry Miller <hank at millerfarm.com> wrote:
>> 
>> The turbo vw uses on their small diesels has very little mass. It spins
>> down fairly quick, in general it doesn't do much in the parking lot and
>> so it mostly stopped and doesn't need oil on shutdown. Now if you pull
>> off the hiway and turn the engine off as soon as you come to a stop (or
>> before) there is a problem, but most people don't drive that way. Big
>> engines with big turbos often need more spin down time, as do people who
>> upgrade their turbo. From the factory people report few problems with
>> their turbo that can be traced to shutdown.
>> 
>> Not that there is never a problem, turbos spin at 100000 rpm at high
>> temperatures. This is hard on any oil.
>> 
>> --
>>  Henry Miller
>>  hank at millerfarm.com
>> 
>>> On Mon, Nov 14, 2016, at 04:46 PM, vschwartz1 at comcast.net wrote:
>>> Stephen/Spencer;
>>> These comments now bring up two more questions. How does the VW turbo get
>>> it's bearing lubrication on engine shut down? Or is that the reason for
>>> the high dollar oil. I know that automotive turbo's need some type of
>>> lubrication for the spin down from the high RPM's of some operation.
>>> Don't know, maybe the VW doesn't have that problem or addresses it some
>>> other way. Comments????
>>> Second question. Does that DPF ever need to be cleaned or replaced? I
>>> have noticed that most all large trucks now apparently run with a DPF
>>> because very few emit smoke or even odor for that matter. When you see
>>> smoke it is usually from an older engine or there is something wrong with
>>> the engine.
>>> GIL
>>> 
>>> ----- Original Message -----
>>> 
>>> From: "Stephen Offiler" <soffiler at gmail.com>
>>> To: "Antique" <at at lists.antique-tractor.com>
>>> Sent: Monday, November 14, 2016 6:41:42 AM
>>> Subject: Re: [AT] Synthetic Oil
>>> 
>>> I've got a VW TDI also (mine is a 2013 Jetta Sportwagen) and I found
>>> Spencer's lab test results very interesting. In my case, I must admit
>>> that
>>> the free scheduled maintenance for 3 yrs 36K miles did its job: get the
>>> customer comfortable with returning to the dealer for maintenance. With
>>> 57K right now, I've never even lifted the hood on that car except to fill
>>> the windshield washer fluid. I am going to miss it when it's gone.
>>> 
>>> A comment on the fancy oil VW requires. Yes it's turbocharged as Spencer
>>> mentioned, which creates certain oil requirements, and beyond that is the
>>> issue of the Diesel Particulate Filter. It is this emission control
>>> device
>>> that removes the characteristic diesel smoke and odor. But the DPF is
>>> sensitive to ash buildup, and therefore requires a "Low Ash" motor oil.
>>> (True for any diesel equipped with DPF, not just VW)
>>> 
>>> SO
>>> 
>>> 
>>>>> On Mon, Nov 14, 2016 at 7:14 AM, Spencer Yost <yostsw at atis.net> wrote:
>>>> 
>>>> It does have one Gil.
>>>> 
>>>> Or use 15-40 Rotella in my Ford 861D. It seems to work
>>>> 
>>>> Spencer Yost
>>>> 
>>>>> On Nov 13, 2016, at 10:13 PM, vschwartz1 at comcast.net wrote:
>>>>> 
>>>>> Spencer, does that VW have a turbo?
>>>>> 
>>>>> ----- Original Message -----
>>>>> 
>>>>> From: "Spencer Yost" <yostsw at atis.net>
>>>>> To: "Antique" <at at lists.antique-tractor.com>
>>>>> Sent: Sunday, November 13, 2016 8:17:45 PM
>>>>> Subject: Re: [AT] Synthetic Oil
>>>>> 
>>>>> The only bad thing about my VW diesel(beside dieselgate) , is that it
>>>> requires a synthetic oil that's pretty expensive. And it called for oil
>>>> change intervals of 10,000 miles. I've never been a fan of oil change
>>>> intervals that are that extended and I am certainly not a fan of
>> expensive
>>>> synthetic oil. But because of that expense I decided to use Blackstone
>>>> lab's oil analysis reports to ensure that these extended intervals
>> actually
>>>> were valid.
>>>>> 
>>>>> After the free oil changes up to 36K miles, I changed the oil at
>> 10,000
>>>> miles and sent a sample. Oil was absolutely great and still within
>> spec.
>>>> Next oil change I want to 11K and still within spec. And so on our way
>> up
>>>> to 13,000 miles. Oil was still completely 100% within spec and no
>> metals
>>>> that would indicate excessive wear. I stopped there but I could
>> probably
>>>> could change at 15K.
>>>>> 
>>>>> So I do believe in those 10,000 mile intervals with synthetic oil for
>>>> that engine. I'll be glad to post the reports if anyone's interested.
>>>>> 
>>>>> However....
>>>>> 
>>>>> I did it for my Ford power stroke 6.0 L engine too. The shear
>> properties
>>>> of synthetic oil begin to degrade at 10k miles. So I use regular Dino
>> oil
>>>> and change every 3000 miles on that one.
>>>>> 
>>>>> Hope this helps,
>>>>> 
>>>>> Spencer Yost
>>>>> 
>>>>> 
>>>>> 
>>>>> Spencer Yost
>>>>> 
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