In the UK Euro Car Parts sells Petronas Syntium (in its various forms) and I have just put some Syntium 5000 AV in the 159.
Petronas (Malaysian owned) make Selenia and of course are big sponsors of F1.
The oil I put in the 159 was made in Italy
I change the oil in between standard oil change intervals so I thought I would give it a try as in my opinion new oil is better than old oil.
Previously when I have changed it I have used Mobil 1
It has been in 1000 miles now and the car has not seized up.
The problem with oil is how do you know in the short term how it has protected your engine?
There is always a lot of discussion on the Sud forum debating 'synthetic versus mineral' in Sud engines.
I use Shell Helix 15w/50 Synthetic in the Sud and usually chage it sub 3000 miles.
I work on the principle that the Sud engine was modern in 1972 and every handbook I have seen on the Sud has just been updated to recommend the latest type of oil sold by the brands that Alfa recommend.
My wife used to have a Metro Turbo in the late 80's and I used to run it on Mobil 1. Now that old A series was an old engine and the oil is used to lubricate the engine, turbo, gearbox and final drive.
I used to love Mobil 1 because even though the car was used around town and it was in the era when 'black sludge' used to kill engines, whenever In used to take the rocker cover off underneath it was always clean and prestine but if you touched one of the rockers with your finger it left a fingerprint in the oil film that was left covering the engine.
It was not a great car but when I used to use it I used to love thrashing it and when coming off a motorway slip road i used to stop the car open the bonnet quickly and see the Turbo glowing red.
Sorry Brit got carried away there - what was the question again?