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My ’21 GMC Sierra with the base infotainment system honestly has the best midrange and low-end of any GM vehicle I’ve owned—better than the C8 Corvette, Camaro ZL1, Blazer, CT5-V Blackwing, and even the Bose system in my Porsche. To my ears, it’s only missing a bit of high-end clarity, but...

There’s never been a “Supercar” 15W-50—Supercar branding only applies to the 0W-40 and 5W-50 dexosR oils. That’s why the 15W-50 is only recommended by GM for track use.

Amazon still Lists Mobil 15W-50. A 5 quart jug is $28 bucks...

I wouldn’t call 15W-50 a slight increase over 0W-40 — it’s roughly 30–50% thicker at operating temp, which is exactly why GM specifies it for high lateral load conditions. The real difference between the oil weights is in the high temperature, high shear (HTHS) values. A 15W-50 has ~20–30%...

The 15W-50 recommendation on the ZL1 1LE isn’t just about the Goodyear 3R tires—it’s the entire system working together. The 1LE has significantly more aero (downforce) and the Multimatic DSSV dampers allow the car to sustain higher lateral loads more consistently than the standard ZL1. That...

The ZL1 1LE oil weight for track days is 15W 50. 0W 40 is the oil weight for street use. The 5W 50 is for the C8 Z06 & ZR1.

I understand the dealers are now using the Mobil 1 FS oil for changes in the 6.2L L87s because it’s less expensive than the Super Car oil. So yes, I think cost has a lot to do with the expanded list of Dexos R approved oil.

Savage Cadillac is where I got mine.

I’d be very cautious about changing pulleys without a tune. Increasing boost raises cylinder pressures, and the timing typically needs to be adjusted to keep the engine safe. With a 2.18 upper on 92 octane, the bigger concern isn’t hitting 700 hp — it’s whether the ECU will have to start...

I'm going to talk to Tapout Tuning about installing the reservoir when I get back to Ohio in May.

I’d skip tinting the side markers altogether. Instead, go with smoked LED replacements — either single- or double-row LEDs. They look absolutely killer when illuminated and give the car a much cleaner, more modern appearance than tinted factory lenses.

I used the DMS adapter to bleed the intercooler lines on my 2017 ZL1. Removing the adapter from the fill port can make a pretty big mess. I much prefer the Tapout Tuning kit—it includes a plastic rod that plugs the end of the funnel, which makes the process a lot cleaner. On the ZL1, you could...

I got caught up in the mod circus when I owned a 2013 Camaro ZL1 — bigger crank pulley, cold air intake, catch can, the usual stuff. It turned into an expensive nightmare. The biggest issue wasn’t the parts, it was finding someone who could actually tune the car correctly. After the mods, the...

It’s the dirt in the bearing sound that goes up and down in intensity. Towards the end of the video it almost disappears in volume as the engine warms. That sound eventually turned into a constant loud squeal that necessitated replacement of the pulley.

I had almost the exact progression on my previous 2017 Camaro ZL1. For the first couple years, there was an unusual noise on cold startup that would disappear as the engine warmed. In year two it turned into a loud squeal, which ended up being a bad bearing in the supercharger idler pulley. The...

“Stuck with” is a good choice of words to describe the Tremec DCT in the C8.

The Tremec TR6060 in my previous ‘17 ZL1 would shudder a little when taking off in first gear when the transmission was fully warmed up on a hot day. Everything I read said this was normal behavior for the TR6060. OP, what you’re describing is classic low-speed clutch shudder when everything...

Are you trashing your car? Why don’t you want to go with Carbotech 1521s? I put them on my 5BW this past summer and have been very satisfied with their performance. They’ve reduced the brake dust by roughly 80%.

Whether people want to believe it or not, a manual Corvette seems increasingly likely. My guess is that it will debut as an option on the “unofficial” Grand Sport variant that seems to populate so many threads on the Corvette Forum. If Porsche can offer a manual transmission in its mid-engine...