I guess you don't run a catalyst or O2 sensor. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dan N
Sent: Sunday, August 16, 2015 1:44 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: From flickering oil light to valves clacking

at every oil change I substitute a quart of oil with Lucas engine oil additive

I use this oil with high zinc...

http://lucasoil.com/products/hot-rod-high-performance/hot-rod-classic-car-20w-50-motor-oil