[s-cars] Castrol GTX High Mileage Oil

[Larry]

I personally would be uncomfortable running dino in ANY turbo vehicle, temps at the turbo get remarkably high and the random distribution of polymer molecules in dino leave a number of chains capable of coking. Even the distilled (extracted?) synths (looking at you Castrol Syntec!) have much more uniform molecular distribution and are much less likely to coke. 

Did your tech say why he recommended the switch? If his thought was, at 245K miles, the car hasn't long for this world, save some money on the oil, I guess it'd make sense, but if the M1 5W-30 has been working well with no changes over time, why mess with it?

Sent from my iPad

> On 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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