Standard all makes/all models green/yellow coolant can be used in any engine, and it was factory fill in yours.
The tabs are no longer used or recommended by GM. They're known to clog small coolant passages.
A flush isn't recommended or necessary unless you're trying to clean out a stop leak product.
Refill with a 50/50 mixture of coolant and distiller water. Tap and spring water has minerals in it that can cause corrosion.
----------
If the fluid doesn't appear as a bright, clear red on the dipstick, replace it. If it looks good, you can change it if you want, it will only do good. Personally, I tend to change trans fluid at ~80K, or whenever I buy a vehicle if it has more mileage than that.
The tabs are no longer used or recommended by GM. They're known to clog small coolant passages.
A flush isn't recommended or necessary unless you're trying to clean out a stop leak product.
Refill with a 50/50 mixture of coolant and distiller water. Tap and spring water has minerals in it that can cause corrosion.
----------
If the fluid doesn't appear as a bright, clear red on the dipstick, replace it. If it looks good, you can change it if you want, it will only do good. Personally, I tend to change trans fluid at ~80K, or whenever I buy a vehicle if it has more mileage than that.