http://www.conocophillipslubricants.com/brands-products/Results.aspx?brand=Kendall+Motor+Oil
 
Since no one answered I'll add some comment. 
 
Back in the day a number of oils were popular amongst the performance and import crowd. This one one of them. Castrol GTX, Cam 2 and a few others were also popular especially for the higher viscosity crowd. 
Assuming this oil is new enough to have the ratings the Vanagon originally required I see no reason not to use it. keep in mind that even today this product is still a high ZDDP additive product which while is good for our cam shafts can be bad for the O2 sensor and Catalyst. Be carefull not to overfill. 
 
Dennis
 
> Date: Sat, 19 Mar 2011 19:30:32 -0500
> From: inua@CHARTER.NET
> Subject: Kendall GT 1 Motor Oil
> To: vanagon@GERRY.VANAGON.COM
> 
> I don't believe that I have ever seen this oil discussed on the list.
> 
> I have inherited a couple of cases of Kendall GT 1 High Performance
> 20W50 and I'm wondering if anyone has any experience with it where
> Vanagons are concerned. The oil came with the '91 Carat I got a little
> while back. I'm assuming that is what was run in the van, so have an
> interest in staying with that oil - IF it has a good performance
> reputation where WBX engines are concerned. I did just a bit of reading
> on it and found comments that todays Kendall is not yesterdays Kendall
> 
> Any input is apprecaiated.
> 
> John
> 
> --
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.com