TreatMyClot.com 300
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| Venue | Auto Club Speedway |
|---|---|
| Location | Fontana, California, United States |
| First race | 1997 |
| Distance | 300 miles (480 km) |
| Laps | 150 (Stage 1: 35 Stage 2: 35 Stage 3: 80) |
| Previous names |
Kenwood Home & Car Audio 300 (1997–1998) Auto Club 300 (1999–2002) 1-800-Pitshop.com 300 (2003) Stater Brothers 300 Presented by Gatorade (2004) Stater Brothers 300 (2005–2010) Royal Purple 300 (2011–2013) Treatmyclot.com 300 (2014) Drive4Clots.com 300 (2015) Treatmyclot.com 300 by Janssen (2016) Service King 300 (2017–present) |
| Most wins (driver) | Kyle Busch, Matt Kenseth (4) |
| Most wins (team) | Joe Gibbs Racing (6) |
| Most wins (manufacturer) | Chevrolet (7) |
| Surface | Asphalt |
| Length | 2.0 mi (3.2 km) |
| Turns | 4 |
The Service King 300 is a 300-mile (480 km) NASCAR Xfinity Series held at Auto Club Speedway in Fontana, California. The inaugural event occurred in 1997. The race is usually scheduled in late March as the fifth event of the schedule, and as a support event for the Sprint Cup Series' Auto Club 400 (although in 2008 it was held after the Cup Series race because of a rain delay). It has previously been held in October and late April or early May. Kyle Larson is the defending winner of the event, after winning it in 2017.
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