[s-cars] Castrol GTX High Mileage Oil

[Taka Mizutani]

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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