Mike, will the log section be used indoors or outside? If the latter, I would especially suggest a petroleum oil based preservative, instead of Anchorseal.
I've been through three white oak log sections in the past 16 years for my 300 lb anvil. It sits under a roof but is on top of dirt and gravel. The last stump has received multiple soakings in used automatic transmission oil (both ends) and thus far it has lasted the best. I prefer the ATF because it does not leave the dirty residue that used engine oil does. If you opt for used engine oil, be sure to source some that was drained from diesel engines, as it does not contain the carcinogenic byproducts that the used gasoline engine oil does.
The enemy of the stump longevity is bugs and rot, and Anchorseal won't stop either. If not used ATF, find something that will soak in, preserve the log and kill any bugs, such as diesel, kerosene, etc. Turpentine is another (albeit expensive) option and its smell is reminiscent of the old feed stores that used it for a floor sealer.