[T3] Stupid question #395 Oil change time?

Jim Adney jadney at vwtype3.org
Wed May 29 08:08:47 PDT 2019

On 29 May 2019 at 11:16, Dennis Stiefel wrote:

>    c) I'd be surprised if STP had ZDDP in it, as that would make it a very
>    bad choice for any modern engines. I'll check on that later this week at
>    my FLAPS.
> Been using in mine for zinc supplement for a while now. If it doesn´t have it then I need to take legal action for false advertising.
> http://www.stp.com/products/oil-additives/oil-treatment

Most of what I found on a Google search said that STP claimed the amount 
of zinc was secret, but one person claimed that he got someone to admit that 
it contained 5 ppm, whereas 1200 ppm is considered necessary for good 
protection under normal operation.

IF this is accurate, 5 ppm is enough to make their label TRUE, but irrelevant. 
It's also little enough that STP won't get in trouble with the EPA for poisoning 
tens of thousands of catylitic converters. This seems consistent with the fact 
that STP markets this product for all engines.

I hope it's clear to everyone that adding good amounts of ZDDP to a modern 
engine with catylitic converters is a REALLY BAD idea.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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