liquid wax ester ?sound a lot like methyl ester,(the bio part in diesel)don't put too much ester anywhere.if you keep it to less the 1% (preferably 0.5 %)and you should be fine.but I tend to agree with mobil.it shouldn't be needed ,the only exeption is the season change ,like from winter to summer or the summer to winter (twice a year)when temperature stay in the minus or when the temp stay in the plus it might be a good idea to put something like this product ,but every week ?nope ,I don't think you need this every week