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Weasel Diesel · 04-28-2012, 08:03 AM

STP oil treatment is a high level ZDDP product for high lubriticity ( ZDDP boost is also needed for flat tappet cams now that modern oils have cut back on ZDDP content ). The high milage version adds seal swellers to it to chemically soften seals that have hardened over time. Trying to bring "Rubber" or neopreme seals back to life isn't gonna happen. It breaks down the compound of the seal to make it softer. Does it work? Yes, for a while, a short while, then when the seal fails, it goes quickly, and aggressively. From the scientific tests posted at Bob the oil Guy's website, additives like ZDDP, and metal pore penetrating products like Zmax help out a bit fighting wear, however seal swellers will doom those seals.

I remember back in the 70's, the big "Fix" for leaking seals was to put brake fluid in the oil to swell the seals,.... stop leaking about 2 weeks then you would start seeing major seal failure.

04-28-2012, 08:03 AM	#5
Weasel Diesel Registered User Join Date: Sep 2011 Location: Chesterfield, Va. Posts: 339	Re: High Mileage Oil Treatment STP oil treatment is a high level ZDDP product for high lubriticity ( ZDDP boost is also needed for flat tappet cams now that modern oils have cut back on ZDDP content ). The high milage version adds seal swellers to it to chemically soften seals that have hardened over time. Trying to bring "Rubber" or neopreme seals back to life isn't gonna happen. It breaks down the compound of the seal to make it softer. Does it work? Yes, for a while, a short while, then when the seal fails, it goes quickly, and aggressively. From the scientific tests posted at Bob the oil Guy's website, additives like ZDDP, and metal pore penetrating products like Zmax help out a bit fighting wear, however seal swellers will doom those seals. I remember back in the 70's, the big "Fix" for leaking seals was to put brake fluid in the oil to swell the seals,.... stop leaking about 2 weeks then you would start seeing major seal failure. Last edited by Weasel Diesel; 04-28-2012 at 08:09 AM.