Signature Series 0W-40 Synthetic Motor Oil Amsoil. Meets SRT specs and well rated. ^^^ I'm sure there are other acceptable oils on the market. However, I've been using the 5w30 Signature in my '02 WRX for years and believe it's a high-quality oil that holds up well to modern performance engine demands. I know Mopar says to use Pennzoil Ultra Platinum 0w40 in my new 1320, but it'll get Amsoil when I change the oil & filter the first time.
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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