I got some engine oil and a filter to change myself from Bauer Millett and on their system the oil used for both the 155GPA and esseesse version during service is the selenia 5w-40, however they did have the silver 2L tins branded Abarth 10w-50 which is what I have put in. Must say with the filter housing fully drained she took a good 3Litres if not a little more. They told me that Selenia recommend the 10w-50 for the Abarth product.