do i have to use 5w20 motor oil
You don't have to do anything, but, what does your owner's manual recommend??? If you care and you should, follow the instructions.
173,500 miles. I would ignore Mark and the owner's manual and run 5w30 in a name brand conventional oil changing it every 5,000 miles or 1 year whichever comes first. I personally use MotorCraft Synthetic blend available at you local Walmart for a good price.
Well, my remarks were rhetorical, but, again, you've gone 173,500 miles on the current oil recommended so that's worked pretty well for you...My question is what's going on that requires you to change what you are doing?? If you are burning oil or have worn rings and valves, going to a 5-30 may not help you out that much,. If you are burning a lot of oil, you'll likely continue with this problem until your car is fixed..... And, 173,500 miles is a lot, what are you complaining about? I'm sure that you can go to about 200,000 miles easily, after that, it will require more attention.. Good luck.
some 05 call for 5w30 and some call for 5w20 same year same engine
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