Electric Vehicle Forums - Advice re: maintenance on 08 Altima Hybrid

Hello, proud owner of 2008 Altima Hybrid (fully loaded with Bose & Nav). Bought it 4 years ago with 87K mi & now have 143k on odometer. So far has been very reliable and a great fun ride. Here is the maintenance.that I have done so far. Need advice what else I should do to keep it running another 2-3 years (maybe more if no good replacement is available).

Every 5K miles - oil changes (at dealer but conventional using 5w-20, I believe). Last oil change switched to Mobile 1 synthetic (0w-20 as recommended) and getting 32+mpg (previously was around 30) & over 600 mi from tank which makes me think battery is still good.
100K - drained and refilled CVT (done by dealer), drive belt (serpentose?) replaced.
120k - replaced spark plugs and coils (due to 1 dying and getting me stranded on the road)
Brakes and all engine mounts in last 2 years.

Question: having never replaced coolant fluids (including for hybrid battery) should I do it ASAP? Should I do another CVT drain/refill @ 150K?

What is general consensus on any additional maintenance you would suggest? I heard once from dealer shocks are leaking, but subsequent appts (oil changes with inspections) didn't bring it up. I upgraded to 215/55/18 (alloys from 370Z) which ride harsher, so don't really know if shocks are bad ;). Like it that way to keep me awake on the road after long day at work (total drive 2.5 hrs a day mostly city traffic, California mild weather).

I am planning to do an oil analysis at next oil change to see what condition the engine is in (and if it burns any oil) and based on the results will decide if the car is worth investing more $$. Is that a good approach? Thanks for your time and advice.
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