My blazer just hit 90,000 miles...are there any tune ups i need to do at this point?? all I can think of is to flush the radiator fluid and change the fuel filter. I am good with oil change and tranny Fluid and filter. Good with tire rotations. How about the PCV valve or O2 sensor? should those be changed??..I got the differential fluids all changed. And when i hit 100,000 miles i will change tranny fluid and get 4x4 hub lubed. Is there anything else as of now i should be checking??..thanks

 

I have a similar thread down the page a little.

https://blazerforum.com/m_91998/tm.htm

Just posting to subscribe to yours and let you cross reference what answers you get with what ever I may get.