Thank you all for your time.
I am trying to follow my manuals’ recommendation schedules. 2005 Chevy Malibu Classic (4cyl) and 2005 Chevy Equinox (6cyl, AWD). Both with 140,000 miles. Wondered your opinions on the cost/benefit of the following preventative actions vs. just leave a running car alone. I will state that I love having paid off cars that work, so I’m willing to invest in prevention.
Should I start partial replacements of transmission fluid if I have never had this service done? Per the manual, transmission fluid service is only recommended under extreme driving conditions, none of which apply to me. I agree with the consensus here on the forum that trans-flushes are not necessary and possibly detrimental. However, many have mentioned a simple (partial) fluid replacement as a good idea. Drop the pan, change the filter, and replace any fluid that drained (~1/3-1/2 of fluid). Do I start doing that at 140,000?
Replace spark plugs? Recommended changed at 100,000 miles. I have noticed some hesitations, temp. drops in RPMs, etc that may or may not be remotely related. Wondered if a simple change could (possibly, just maybe, might as well try and see if they) fix the issues.
Had coolant system flushed in one, planning on doing the other. Both recommended at 150,000 miles.
Other than the above, have pretty much only changed motor oil, replaced engine air filters when dirty, and dealt with repair bills and brake/tire bills as they presented themselves. Haven’t touched steering fluid, brake fluid, etc.