Aluminum radiator in. Flushed system once with distilled water, once with distilled water &
Prestone radiator flush (I don't work for them), one more flush with distilled water, then after that. I don't trust using a hose w/ tap water, because the county I live in has some of the hardest water... fagedaboudid (Mickey Blue Eyes reference). I found something that may or may not be a good idea... a leaf blower with a very particular upside-down-ish hand-funnel like grasp into the radiator tank to evacuate the system out the drain. I then filled it with
Prestone concentrate with, of course, a 50/50 mix with (you guessed it) distilled water. The Prestone concentrate seemed like the logical (and less superstitious) choice.
To ensure each flush was sufficiently mixed, I'd take the SHO on a spirited drive around a 5ish mile radius near my house. The exception was when using the radiator flush, which spent a few days and a few spirited drives.
One thing I forgot once or twice: empty the radiator overflow. Your purring SHO will thank you.
I probably did something wrong, please point it out. The most recent drive, with the new radiator fluid, and with all electrical issues solved, was fantastic. The raw power, the fun. The previous owner really put a lot of hard work into the car and you can absolutely tell.
I had a BMW SUV that was absolutely decked out with upgrades and an amazing exhaust overtake me when I was just cruising. I gunned it, but was in the wrong gear & rpm, and although I hung near him, with the momentum he already had, he pulled away slowly... Also, I like the speed limit too much. Every time he let off the exhaust, I heard "SNAP SNAP SNAP".
I'm really not into that scene. I'm more into enjoying a nostalgic thoroughbred that never fails to put a smile on my face. The look, the feel, of authentic SHO.
I'm not trying to cast shade. But if it ain't Yamaha...