Originally Posted By: remmious
Originally Posted By: Mystic
It was my experience that Auto-RX STOPPED an oil leak. I owned a Saturn car that had a small seal leak from an engine seal. After I did an Auto-RX cleaning the seal leak stopped.
If a seal is not damaged Auto-RX apparently can stop a leak. It removes sludge from the seal and allows oil to reach the seal. But if a seal is worn or damaged removing sludge from a seal may cause a leak. The only thing you can do with a damaged or worn seal is to replace it.
(Most) Esters tend to 'swell' seals slightly so it's possible for it to re-seal some old leaks. I don't know at what concentration of esters effects seals or not but it was just a general concept associated with the product. Such as PAO's tend to shrink seals which makes esters a great co-base in those blends (and for many other reasons). ARX may not do anything to seals based on concentration and other ingredients. Maybe just good old conditioners to help improve sealing.
No. That isn't how ARX works.
ARX works by removing sludge buildup on seals.
Sludge coated seals can't get freshly circulated oil on their exposed surfaces, and so they are neither properly cooled or lubricated. In addition, sludge coated seals aren't exposed to whatever seal conditioning and or cleaning agents, present in whatever oil you use, and so of course they will harden, loosing their pliability, to then shrink and become more susceptible to physical damage.
It goes without saying, that sludge coated seals also cannot be reconditioned and restored to usefulness, by whatever seal conditioners and cleaning agents present in your oil. The sludge must first be removed, and that is what ARX does.