Originally Posted by
geargnasher
Joe, I'm gonna add my two cents to other posts as well as yours I quoted, so don't get ruffled on me!
I think those special anti-seep additives are made of hopes and dreams. I've made a hard living for a long time now because automotive oils seep, creep, leak, drip, and squeeze through, by, and out of just about everything our finest engineers can design to contain them. The ony instances I've seen where oil stays put is using Mobil 1 to lube bronze pilot bushings. Fill the center up with oil while holding it on one thumb pad and then put your opposite on top, squeeze the ends until the pressurized oil "sweats" out of the pores on the outside of the bushing. The oil won't get on the clutch and lubricates the transmission input for the life of the clutch disc and then some. The only reason the oil stays there is the same reason water stays in a damp sponge, surface tension.
Lucas works by affecting the surface tension of oils, both conventional and synthetic, and work it does. Lucas-treated oils tend to "cling" to parts and not form drips or runs, but it does spread and creep everywhere, it just leaves a thicker coat than untreated oil.
It's kinda neat to play with that parts-counter Lucas oil gear display, but, like most product displays, pretty much useless. The REAL work engine or gear oil does isn't done while hanging from the top of the trasmission housing or hanging out on the bottom side of your idle pistons over the weekend, it's done while being mashed and sheared under hundreds of tons per square inch of force at 2-300* F. That's where VISCOSITY matters more than surface tension, and Lucas, among othere fine additives, really help maintain viscosity at high heat and pressure conditions. Superior performance under these conditions is also what makes the long-polymer synthetics desirable, but I have yet to see one that won't leak. Synthetic engine oils are far more likely to leak past rubber lip-type seals than conventional oils because they don't swell rubber as much as conventional oils do. Teflon seals have been developed in limited application (Corvette engines, for example) to function reliably with the full-synthetic oils these engines require.
I just don't believe there is an oil, clock or otherwise, that won't creep. Even grease creeps over time (no pun intended!!).
Gear