its better to stick to fiat provided oil. i very well know how these TASS scoundrels deny warranty if anything fails. sometimes there is no relation with the part broken and their reason. My indicas front wheel ball joint failed and tyre came out and by gods grace there was no accident. they denied warranty saying i dint change oil as per schedule. I argued asking the connection between oil change and this fatigue part failure. no one replied. i also argued that i change oil before schedule and i showed them cans of mobil oil in the indica lying around. still they dint agree to warranty. i spoke to lot of senior managers etc but all in vain. so best way is go to TASS change oil, make sure they make a job card and enter in CRM.