02-23-2006, 06:05 AM
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Renegade Nuns on Wheels
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Join Date: Aug 2001
Location: columbus,
Oh
Cobra Make, Engine: Unique 427 roadster with 351C-4B
Posts: 5,129
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Not Ranked
I contacted STP to be sure. Here is their reply:
"Thank you for contacting us about STP Oil Treatment. We always appreciate hearing from our consumers.
The oil treatment products do contain zincdialkyldithiophosphate or zddp. The amount or concentration of the zddp is proprietary information.
Again, thank you for contacting us. "
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