I used to use RESTORE in my winter cars back in the day. It def works. Takes about 200 miles or so for it to fully work. Helps to increase compression a bit, reduce blow-by I would imagine too.
restore, slick 50, Lucas oil additive… all seem very similar and will get decent results. and to clean out the crank case, use trans fluid and let the engine run for about 20 minutes, then change the oil