i'm using tufoil on my b16a...no problem so far...it makes ur engine rev more smooth...FC not much different...use it when u change ur oil...i'm using 3.7-4 liter of castrol magnatec with 1/2 bottle of tufoil...
interest for sale my car 3SGE engine(m)blizt twinplate clucth with flywheel(6kg) aluminium crank bulley new timing belt, engine overhal clean, hks air filter. i dunno can selling how much just waiting reply