Yes, and your truck will thank you for it. If you completely flush the power steering and re-fill it with synthetic ATF (like Mobil 1) you will notice a dramatic improvement.
What type of "dramatic improvement" will be be noticing? My steering is pretty mellow as it is. Any less feedback and it would be like a Chevy.
2007 Voodoo Blue set up for exploration with the normal stuff and for wheeling 8/73 FJ40, flipped F/R springs, SOA, 60 series front axle, grooved 35 BFG muds, fully locked, 60 series power steering, full cage, 60 series ignition and hydro assist.
I flushed out the factory ATF power steering fluid with AMSOIL (formerly known as AMZOIL) Synthetic PSF (not ATF). Then flushed that out and filled with Synlube PSF. i did this within the first 500 miles of my new FJ. Once it gets discolored i will flush and fill it again.
I recommend keeping up on your power steering maintenance as Toyota isn't known for the best power steering systems. For a real life example, my other half's Lexus 300 had its power steering go at 68,000 miles. And yes, it was properly maintained.
So far, so good with the PSF I'm using. They specify it as universal for power steering systems that use either ATF or regular PSF.
I had a Subaru that specified ATF for the power steering and used the Synlube universal PSF for 60,000. Unfortunately, this car was totalled in an accident that wasn't my fault. So, based on that I think I'll be ok with it in the FJ.
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