I usually don't dilute Tru-Oil,but let it dry completly and take it down to bare wood(I use steelwool on open areas and backed up fine abrasive paper near corners,etc).After cleaning with a tackcloth,the open pores can be seen.Repeat as many times as necessary to fill all pores(the finish is in the wood).Then you can do any final finish you like.I usually just rub one coat of boiled linseed oil and if it gets spotted or scratched in use,buff it up with steelwool and rub on oil again.
Mike