[Fot] Zinc Additive.

[Larry Young]

If I remember the ratings, SJ was the good stuff, which is now 
impossible to find.  SM is the low zinc rating.  There is an 
intermediate SL rating which is available in straight weight oils.  That 
is what I've been using  in my old cars that I run on the street without 
using any zinc additives.  These are fair weather cars anyway, so I 
don't see the need for multi-visc.

On 10/31/2011 12:47 PM, Glenn Franco wrote:
> Hi All
>
> I have torn down 4 TR6 engines in the past 4 months all with wiped out 
> cams.
> The latest was a performance reground cam with low miles and 2 lobes 
> severely worn.
>
> I know this has been a topic/thread in the past but wondered what if 
> any Zinc Additives are out there.
>
> For the rebuilds, I used either Brad Penn 30wt break in oil, Valvoline 
> Racing oil (20w50) and Rotella ( 15w40 highest in zinc of the diesel 
> oils)
>
> As these engines age their owners are going to start changing their 
> own oil, Most have switched back to Castrol 20w50.
> As I understand that formula has changed to the low zinc for emissions.
> I'm running it in my engine as well.
>
> I'm now very concerned and would like to get this under control with 
> an additive.
>
> Any Suggestions?
> Thanks in Advance
> Glenn Franco
> Too Many TR's
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