Replaced another O ring which had an extremely slow coolant leak on my aftermarket AT aluminum radiator where the drain plug is. It's been months since I replaced the original O ring. Not sure if the O ring that it came with was crap, but the other one I replaced it with was a bit too large on the ID, so I'm trying out an O ring with a smaller ID and slightly thicker to see if the slow leak gets fixed. I also refilled missing coolant into the reservoir coolant tank, I'm using that to determine how much coolant is missing since the aluminum radiator holds much more coolant compared to the OEM one.
Checked Sprintex oil level, it's almost been about 4 months since the last refill on oil, but it looks like the oil level is in between the level on the dipstick which should be fine?
Checked serpentine belt level, it is very close to the middle line.
Checked auto tensioner, it still has rattle which means I may need to replace it eventually? At least there is no noticeable noise even though it rattles quite a bit.