Liquimoly Speed-Tec

[BMWTurboDzl]

Just reporting my experience with Speed-Tec. Used it when on track with a C7 Corvette Grand Sport. Could not feel any difference, better or worse. In a second C7, it seemes to have contributed to an O2 sensor failure. I didn't make the connection right away given no issues in the first car but when I got a CAT code, subsequent misfiring and more O2 sensor codes only @ the track after using Speed-Tec, I will use it no longer. Odd it was fine in one C7 and and not in another. YMMV.

Is this your review at FCP Euro?

Terry O
on Thu, Aug 22 at 10:09AM


Speed Tec Gas Additive causing O2 sensor failure
On 2 seperate occasions, once @ VIR in Oct 2023 and again at Road Atlanta in March 2024, the use of Speed Tec Gas Additive caused the upstream O2 sensor on the passenger side to fail on my 2018 Corvette Grand Sport. The original sensor was OEM, the 2nd a Denso part I picked up @ an O'Rielly's in South Boston Va. Car has run without issue at 6 track days since 3rd sensor, another OEM part was installed.