Only 15w50 I've seen was a Pennzoil racing oil. Used it in my Westy before I put a subaru power plant in.

On Jul 31, 2011, at 12:47 PM, Dennis Haynes wrote:

> I have never seen Castrol GTX in 10 or 15-50. The norm is 20w-50. This is an
> oil for the modified and collector car crowd. Very good stuff and will hold
> higher pressure than a 15w-40 Diesel oil.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Karl Wolz
> Sent: Saturday, July 30, 2011 2:28 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Oil Pressure observation.
>
> That seemed to be something of a consensus after the discussion of zinc
> additives, or a lack thereof, a month or so ago.  I've been using Castrol
> GTX 10w/50 (might be 15, thinking about it), and am considering changing
> when I next change oil before I leave Phx for Seattle in early September.
>
> I'm looking forward to someone taking me by the hand and saying, "Do it this
> way" (and being correct about it, of course).
>
> Karl Wolz
>