Some clain to have had success by flushing engine prior to an oil change with Bardahl Engine Flush
http://www.alfaowner.com/Forum/showt...hlight=bardahl (Alfenia: *Diesel* sound gone)
http://www.alfaowner.com/Forum/showt...t=engine+flush (Sounds like a diesel ??)
Probably a 10W60 Synthetic such as Castrol 10W60 RS
IF Bardahl works then it is doing so because the Variator has something like varnish preventing it from working properly. This may be in the oil feed to the variator is restricted. It is definitley worth a try but do not use an engine flush on a regular basis.
"Many of the older, better-known oil treatments
on the market do not make claims nearly so lavish as the new upstarts.
Old standbys like Bardahl, Rislone and Marvel Mystery Oil, instead offer
things like "quieter lifters," "reduced oil burning" and a "cleaner engine."
Most of these products are made up of solvents and detergents designed
to dissolve sludge and carbon deposits inside your engine so they can be
flushed or burned out. Wynn's Friction Proofing Oil, for example, is 83
percent kerosene. Other brands use naphthalene, xylene, acetone and
isopropanol. Usually, these ingredients will be found in a base of standard
mineral oil. In general, these products are designed to do just the
opposite of what the PTFE and zinc phosphate additives claim to do.
Instead of leaving behind a "coating" or a "plating" on your engine
surfaces, they are designed to strip away such things. All of these
products will strip sludge and deposits out and clean up your engine,
particularly if it is an older, abused one. The problem is, unless you have
some way of determining just how much is needed to remove your
deposits without going any further, such solvents also can strip away the
boundary lubrication layer provided by your oil. Overuse of solvents is an
easy trap to fall into, and one which can promote harmful metal-to-metal
contact within your engine. As a general rule of thumb these products had
their place and were at least moderately useful on older automobile and
motorcycle engines of the Fifties and Sixties, but are basically unneeded
on the more efficient engine designs of the past two decades. "