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Uh, yeah, hence why I asked the question. Forgive me for my ignorance, and thanks to all for their knowledge and experience.

Mini crop circles.

Look, guys, to add clarity to my post. This is NOT about cost. It is about risk. If there was no risk to the engine and high test only adds HP then I would put in regular gas. If there is risk to the engine (and there seems to be consensus here) then of course I will put in high test gas!

I have run Shell 91 and I have run 87. Given all the expenses for tracking, I'm not trying to pinch pennies on gas. I just did not know if there is a risk, and according to the wonderful responses I am getting, apparently there is! Exactly, and thank you.

I'm sure there will be some strong opinions on this, but ... Is there any good reason not to run regular gas for track day? That's what I have been running most of the time. I don't care about a little extra HP, and fuel cost for an out-of-town track weekend really adds up. I just don't know...

Hey @Cobra Jet why not edit your Post #1 to list all the current 10R80 TSBs, and perhaps strikeout any that were superseded? That would always be the current one-stop shop location for us.

So, it was like I said. :wink:

No, I did a lot of research, and then designed it myself. That photo highlights the checkvalve and inline filter with the cooler. More details and photos found at My Diff Cooler Build.

I wonder if I can use something like Hagerty Drivers Club for the first 100 miles, and then my daily insurance for the second 100 miles.

I know. I remain skeptical.

I agree with others that shipping service quality seems to be regional. I prefer FedEx because I have had more positive experiences with them than UPS. Others have the opposite experience. USPS Ground Advantage has affordable rates now. I use the self-serve kiosk at my nearby PO. This...

I use Valvoline 75w140 in the squeeze pouch. Comes with modifier. Affordable. Walmart stocks it. The squeeze pouch makes it so easy to install. I run 140wt even though I installed a DIY diff cooler. Track diff temp still gets up to 230F in the afternoon. If your car is all street driving...

Please try removing the screw holding the eBrake cable to the knuckle. Then unbolt the caliper and hang it out of the way. This allows you to tilt the shock outboard and twist it to get the bottom 'T' to pull out and upwards from the control arm. I don't recall if I had to remove the rotor...

Gadzooks!

How far and how much? Or was it AAA?

Yes, I would use distilled. It is cheap at the grocery store. Just me, but I'd check with other cars to see if there coolant level was about the same as mine. (My car is in storage for another week or I'd post my own photo.) Another related question is "When should I replace my coolant?" I...

If you are trying to save money by staying with your staggered wheels you can even consider getting 4 identical tires. That will double the warranty, and the extra 1/4" bulge on the fronts may not be any more noticeable than the slight gap difference. In fact, the wheel gap would be the same...

I think your photo is proving my point in post #5 above. In that you may add some coolant, only to find it back at this level anyway. Again, any coolant in the expansion tank tells me that the radiator has all it needs. An empty expansion tank would start me to investigate further. BTW...

Even so, I just suspect you will find your claim rejected everywhere. I run 275/40 square on 9.5" O-Z rims. Wheel gap looks identical front and rear. I don't lower my car either, so the gap is uniform all around the fender. Furthermore, your speedo/odo is calibrated for 275/40 in the back...

My PS4S are on only for track days including driving to and from the track. They are 5 years old. About 6 or 7 32nds left. They refuse to wear out! But I will keep running them until they wear down. Chalk up their sliding around to more car control experience I guess! I think OP would have to...