same thing happened with me when i asked them to change oil in my linea. the worker went and got some oil. i asked them what oil is it. they said castrol. i went running to the parts dept and asked them why are they putting castrol. then he said the workers dont know but when they get job card to us we tap the oil from selenia drums and give them. we make sure for fiat diesel they give right oil. and they showed me the barrels too. i was relieved a bit still now this thread is bringing doubts in my mind. but i think its was selenia as i compared the color of oil in the drum and what the worker had got.