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I used with OEM fluid without issue. OEM is a DOT4 fluid so it’s not bad stuff. I flushed OEM with Amsoil to try their new brake fluid out and it worked real well too.
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The DOT4 "Heavy Duty" fluid was rated for ~540 degrees F but the DOT 4 LV used on the GT350 is lower at ~510 degrees.
See here on page 4: http://www.msds.ford.com/documents/189224 A_GBEN.pdf
Seeing that made me a bit less comfortable with the OEM fluid on track. I'm pretty hard on brakes...
You’ll want either the longer bolts or the caliper studs when changing pads. If you don’t have either I have extra sets of bolts. Send me a PM if you want a set.
I use Pagid RS29’s. While the stock pads will work you’ll burn through them quickly. If you’re running 95% you’ll want quality race pads.
Any of you guys with the ST43s notice that they don't cover the entire swept area on the rotor? There's a solid ~1/2" of unused rotor inside the pads. Odd.