Thanks Keven, very intesting. I answered before reading the hint and so missed 2. here are my answers/guesses 1-D; 2- A (3); 3-B; 4- 5; 5-D; 6-A; 7-C; 8-B; 9-D; 10-D

WSS and ACEA CONFUSED ME I think ACEA refers to diesel engines, possibly automotive diesels Login to read more.