There are various brews. Four were tested and compared in the UK -
phosphorus, manganese, potassium and sodium. There may be others. Wear rates
varied, phosphorus gave about 10% more wear than lead, manganese double,
potassium triple and sodium five times. Castrol Valvemaster uses phosphorus
and I've always stuck to that. In fact one shouldn't mix additives as they
can inter-react and cause valve sticking problems, apparently. A 250ml bottle
treats 250 gallons and has a handy dispenser marked in litres. Costs about 10
quid for a bottle so only adds pennies for peace of mind. LRP when it was
available in the UK used potassium, but only at about half the normal dosage
so it didn't knacker the cat if owners put it into their modern cars!
PaulH.
----- Original Message -----
... what are the ingredients in the
additive?
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