dont know if any of you have used this but we have been using it
for a while at the garage i work at, its called ametech and basically
you just pour it in engine when doing an oil change.
it isnt your typical oil additive that sludges up everything and tries
to hide knocking or rattling sounds, this stuff actually repairs whatever
is makng the noise. sounds hard to believe but it really does work.
it contains copper,silver and lead particles which coat bearings etc.
im not making anything from advertising it and i have nothing to do
with the seller, i just thought i would let you know about it as just
recently i used some in the other halfs motor and its made a hell of
a difference


http://cgi.ebay.co.uk/AMETECH-ENGINE...QQcmdZViewItem

 

my mate had some but he said its not good for turbos but other car its ok i dont no y

 

i have not tried it in my rs as ive not needed to yet lol,
but the manufacturers say that it is perfectly safe for
use with turbocharged engines.