The temperature light is blue when is the engine is colder than the preferred operational temperature range (around 90C I believe) and is red when the engine is hotter than it should be. As a precaution, wait for about 20-30 seconds in mornings and don't push your pedal too hard while the cold light is on.
Regarding atf, it's safe to assume that it has been changed. i would recommend you continue using the current one unless:
(a) it is brownish or blackish (b) a drop of it is not fully absorbed by a tissue (indicating metal shavings or something similar) (c) after a drive, atf smells like a burn instead of a fruity medicine (d) there is something wrong with the drive (slow acceleration or vibration) and it's not fixed by anything else.
Regarding lubricant, well.. i wish there were exact answers. maybe someone else can help more! i just took a gamble and settled for a semi-synthetic oil. Totally synthetic might have been drastically different from the oils previously used in the car! Since the shell oil is already inside, let it be for the time being. You can switch to zic A on next oil and filter change (around 4k kms from this change). Then after the first time you put in zic, the next oil change will be earlier than regular (around 3k kms) - as there will be older oil deposits still running around. Then onwards you can change every 5 or 6k kms i believe.
Simply... when O/D is on, the car is allowed to go into 4th gear. When it is off, car only goes to 3rd gear max. (the light actually tells you that it's off - some ppl confuse this too).