For what it's worth one of the original postings on gearbox oil on the barchetta club was very much in favour of Redline oil.........................
"Well , drained of the standard gearbox oil and replaced it with Redline MTL
tranmission fluid , has all the spec of a SAE 75-90 gearbox oil with the
fluidity of an automatic tranmission fluid , makes the gearbox on the
Barchetta way smoother than it ever was , especially the third into second
shift at speed ............. well impressed , seemingly reduces transfer
losses through the gearbox too , ( good for MPG and Performance) , all you
need is two US quarts of MTL about £25 quid delivered from Demon Tweeks and a
12mm allen key and hey presto smooth gearchanges and better MPG can't be bad
, and all for the price of a tank of petrol , go on you know it's worth it
................. Bert."
Regards