On the subject of oil additives, most make you feel good, because you
installed them, a couple seem to have merit, namely, RESTORE = the only
product I've ever seen that makes car go [ a little ] faster. Use on high
milage cars, oil will get very dirty quickly, change after 1000 miles,
repeat treatment, oil will stay cleaner, longer, and performance will pick
PROLONG = improves cold starting.