Thanks David C and Alfamoment for your feedback.
I've been doing some research about this stuff.
Hi I use " Castrol ATF TQ DIII" transmission fluid no problems with it .
hope that helps.
The 'red fluid' mentioned in steering related threads is Tutela GI-E
which is the ATF DIII type used by Alfa from 2005 until certain point in time, presumably in 2008. So, Castrol ATF TQ DIII is the same fluid type as the one that is recommended to be replaced.
I have seen hood labels stating GI-E
must be used (pre-2008) cars, whereas others state GI-R
(post-2008). So, at a certain point, Alfa Romeo effectively changed fluid type.
It is a hydraulic oil, rather than an ATF.
The spec for GI/R states it is "ISO VG 22".
The "22" relates to its cSt viscosity at 40degC.
In comparison, the Castrol D3 ATF mentioned above has a cSt viscosity 36.8 @ 40degC
David, are you 100% sure that GI-R is ISO VG 22? I've found a Petronas' GI-R data sheet where it is stated viscosity 18.5 @ 40degC (http://flcf.onion.it/commonfile/eng/...2_ssic_ENG.pdf
). The bottom line is that I haven't found any Petronas document showing a particular specification for GI-R. Maybe somebody still has the GI-R bottle and can take a look at it, to confirm what fluid type it actually is.
I visited an authorized ZF steering rack repair shop, and although the guy in charge of it didn't know Tutela GI-R (remember, I'm in Argentina). He assumed that the green fluid had to be the fluid intended for electro-hydraulic steering systems, which is also compatible with hydraulic systems as ours. He admitted green fluid has lower viscosity figures than red ones, and also admitted that the slight vibration noticeable when you move the steering wheel could be greatly diminished by using a fluid with lower viscosity.
I told him about steering rack / hydraulic pump troubles suffered by 159 owners in UK and he thought that is highly possible that UK's cold weather and higher viscosity could increase the chance of trouble in the hydraulic system. However, he said he wouldn't replace fluid if he were me, because we have warmer climate here and I don't do sports driving any often.
On the other hand, could anybody who have had the fluid replaced tell me how was the replacement procedure? It was just the hose that goes from steering rack to reservoir (low presure line) released to allow fluid to be flushed, while new liquid was poured into de reservoir and engine was kept idle?