to a member from Singapore
I've not heard of it either...sorry, but then I focus on the work of the Elves (if that sounds strange go to the site's Elvish village and you will catch on...)
What I know from the bottle(green)Castol GTX proline that it is a mineral oil for performance engine, turbo tested, meets the API SM and some other standards.It is different from the normal Castrol GTX. Quite a number of turbo cars are using it and they changed the oil every 5000km. So far the feedbacks are good but I will like to know the HTHS and viscosity of the oil.
Not knowing this specific oil, I can't say for sure, but my guess is it would be fine...for turbos, however, I recommend synthetic. A case can be made for using a high-quality turbo tested mineral oil and changing frequently.
you have to be a little careful with Castrol's labeling/markwting, as what they call one lube in one country can be an entirely different oil elsewhere.
Case in point, Syntrax in Europe is a 75w-90 semi-synthetic gear oil, yet in Australia it is a full synthetic PAO/ester GL5 transaxle lube, possibly eqivalent to something like TAF-X in Europe. There are several versions of GTX here, and one of them (GTX II) is one of their lower end oils, yet back in the seventies the original GTX was top of the heap.
Best bet is get in touch with Castrol Singapore and ask for a PDS (if they aren't online). I've done this in the past with Castrol Oz and they've been very obliging.