Mobil 1 can be had for about $9.99 when on sale at automotive stores locally (you have to be patient and check often. You can get alternative 100% Synthetic for as low as $6.99 at O'Reillys for V-Twins, so there are deals to be had, even saw Mobil I V-Twin at the local DoIt hardware center on sale, so be observant when checking out your favorite store...things can surprise you! As far as Spectrol, Bob's is the lowest I've seen, but do order by the case...