[s-cars] Castrol GTX High Mileage Oil - the real issue is not "seals"

[Scott Justusson]

Sure, that's an option too...  But, I've spoken to a engineering types at OE and race builders both, as those these barriers are used for new/rebuilt engine break-ins.   Most will only use oils with the additives already present.  Haven't seen any documentation from SAE or additive companies why this is preferred, but these builder-types don't use them because they have stories to of toasted engines that was traced to 'adding' these barriers to oil.  But I didn't spend a lot of time on that topic, as most diesel truck oils still have the additives at the higher levels.  

Looking through alll the varieties of M1 oils is like watching the marketing of Coke products.  Intereting trivia I found looking at this a few years ago:  Audi TSB claims M1 TDT oil satisfies most of the latest 50x.xx oil standards, but M1 TDT oil doesn't list any 500.xx specifications on their label.  Why?  I suspect because turbo 'car' owners are a different target market at the Company.  I have also seen inquiries to the engineers at M!, who are obviously told to tow the marketing line.  

Disclaimer:  Follow the oil recommendations in your owners manual, and the label of the oil manufacturer...  (There ya go)

Cheers and HTH

Scott J

 

 

 

-----Original Message-----
From: Cody Forbes <cody at 5000tq.com>
To: Scott Justusson <qshipq at aol.com>
Cc: s-car-list <s-car-list at audifans.com>
Sent: Tue, Dec 17, 2013 7:34 am
Subject: Re: [s-cars] Castrol GTX High Mileage Oil - the real issue is not "seals"


How about using synth of choice and tossing in a can of BG MOA which is a ZDDP 
additive with some other stuff in it? Or Brad Penn which is a very high quality 
Dino oil with plenty of zinc but still pretty cheap.

-Cody Forbes (mobile)

On Dec 17, 2013, at 1:11 AM, Scott Justusson <qshipq at aol.com> wrote:

> Sigh, here we go again....  This has nothing to do with seals, swelling or 
(OMG) the switch from synthetic to dino oil.  This is an educated mechanic 
legitimate concern about M1 products reducing the levels of Zinc and Phosporus 
to comply with the lower EGR/catalyst effects of wear additives, driven by the 
EPA>Car Manufacturers.  One might argue that, esp on cold start, an engine at 
245k would benefit from extra ZDDP(dino)/ZDTP(synth) Zinc and Phosphorus.  
Previous levels were in the 1100-1300 range, the new standard is sub 800.  M1 
Claims this change is safe for new and 'old' vehicles, but I think that is plain 
marketing BS.
> 
> The best compromise to the OP IMO, is to switch to M1 Turbo Diesel Truck Oil 
or a Delvac Synthetic, as both retain much higher levels of cold start/worn 
engine tolerance, wear barriers.  Short of that, a change to a Castrol dino 
product will yield the same results.  
> 
> As a rule I don't enjoy engine oil discussions, but dragged in by a point-by, 
happy to back up the educated mechanic recommendation and concern, than anyone 
focused on 'swelling seals' totally missing the legitimate issue.
> 
> BTW those in select states might just find that M1 Turbo Diesel Truck oil by 
the gallon at Autozone, is less than Wallyworld brand dino oil.  BtstockeduponT
> 
> Taka, you just try to hard, it's the Holidays, and it would appear Mr Rodrigez 
educated mechanic is just looking out for a good customer.
> 
> Cheers
> 
> S "Taka point-by again" J
> 95.5 S6 M1 Turbo Diesel Truck OIl
> 
> 
> 
> 
> -----Original Message-----
> From: Taka Mizutani <t44tqtro at gmail.com>
> To: s-car-list <s-car-list at audifans.com>
> Sent: Mon, Dec 16, 2013 2:50 pm
> Subject: Re: [s-cars] Castrol GTX High Mileage Oil
> 
> 
> I would not do that myself- going from full synthetic to a conventional oil
> with seal swellers doesn't really make sense to me, especially if
> you've had no issues with running synthetic. The synthetic will last longer
> and be more resistant to viscosity breakdown, often has a lower
> pour point and a higher flash point.
> 
> However, you should ask Scott because I am not qualified to answer any
> questions about cars at all.
> 
> 
> On Mon, Dec 16, 2013 at 2:56 PM, Thomas Rodriguez <trodri69 at gmail.com>wrote:
> 
>> My '95 S6 has 245K miles.  Head was rebuilt about 40K miles ago but
>> otherwise the engine is original. I've been using Mobil 1 5W/30 synthetic
>> motor oil for as long as I can remember. Engine runs strong. I add about a
>> quart between scheduled oil and filter changes every 3K miles.  Otherwise
>> there are no signs of burning or leaking oil.
>> 
>> Last week my mechanic recommended we switch to Castrol GTX High Mileage
>> 5W/30. I agreed and have driven about 300 miles with this oil in the
>> engine.  I understand that this oil is not synthetic.
>> 
>> Any thoughts about using the Castrol GTX HM oil?
>> 
>> Tom
>> '95 S6
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