In early January 1995, Dyson Racing's first Mk III took its first laps of the Daytona International Speedway in testing for the 24 Hours of Daytona later that month.
 The team's pilots set the fourth fastest time, behind a trio of Ferrari 333 SPs, but ahead of the brand two new Porsche WSC-95 prototypes.
 For the race itself Rob Dyson, James Weaver, Scott Sharp, and Butch Leitzinger were assigned to the car and successfully qualified sixth.
 The race would however be short-lived as the Ford engine failed after only eleven laps.
 In March, the team entered the 12 Hours of Sebring, and improved their qualifying record with a fifth place starting position.
 The Mk III was able to survive this endurance race and finish for the first time, earning 37th position.

Dyson's second Mk III-Ford was completed by the Grand Prix of Atlanta in April, but it was the first chassis in which James Weaver achieved victory, giving Riley & Scott their first victory as a constructor in only their third IMSA GT event.
 The season further improved as the team's second chassis won three consecutive races at Watkins Glen, Sears Point, and Mosport, as well as earning the Mk III's first pole position at the Mosport event.
 Dyson Racing ended the debut season with the Mk III by finishing first and second at New Orleans.
 James Weaver finished second in the Drivers Championship, two points behind Ferrari driver Fermín Vélez.

After a successful debut season, several teams purchased Mk IIIs for 1996.
 General Motors instigated the use of Oldsmobile Aurora V8s by the Riley & Scott-backed Doyle Racing, Dyson returned with their two entries.
 Doyle Racing immediately showed the potential of the Mk III-Oldsmobile combination by winning both the 24 Hours of Daytona and the 12 Hours of Sebring.
 Fighting throughout the season with the various Ferrari and Riley & Scott teams, Doyle won two further events before Dyson Racing ended the season with three straight victories.
 Doyle Racing's Wayne Taylor earned the WSC Drivers Championship, while Oldsmobile was able to win the Manufacturers Championship.
 Doyle's Mk III-Oldsmobile was also flown to Europe that season to participate in the 24 Hours of Le Mans.
 The team qualified ninth, but a transmission problem forced the car to retire after fourteen hours.

The 1997 season began for Riley & Scott in the same way the 1996 season had, with a second consecutive victory at the 24 Hours of Daytona, this time earned by Dyson Racing.
 Ferrari was however able to prevent a similar repeat win at the 12 Hours of Sebring, but Dyson rebounded with five wins in the nine remaining races in the 1997 season to win the WSC Teams Championship.
 Dyson's Butch Leitzinger won the Drivers Championship and Ford secured the Manufacturers Championship, giving Riley & Scotts a clean sweep of the series.
In early January 1995, Dyson Racing's first Mk III took its first laps of the Daytona International Speedway in testing for the 24 Hours of Daytona later that month.  The team's pilots set the fourth fastest time, behind a trio of Ferrari 333 SPs, but ahead of the brand two new Porsche WSC-95 prototypes.  For the race itself Rob Dyson, James Weaver, Scott Sharp, and Butch Leitzinger were assigned to the car and successfully qualified sixth.  The race would however be short-lived as the Ford engine failed after only eleven laps.  In March, the team entered the 12 Hours of Sebring, and improved their qualifying record with a fifth place starting position.  The Mk III was able to survive this endurance race and finish for the first time, earning 37th position.
Dyson's second Mk III-Ford was completed by the Grand Prix of Atlanta in April, but it was the first chassis in which James Weaver achieved victory, giving Riley & Scott their first victory as a constructor in only their third IMSA GT event.  The season further improved as the team's second chassis won three consecutive races at Watkins Glen, Sears Point, and Mosport, as well as earning the Mk III's first pole position at the Mosport event.  Dyson Racing ended the debut season with the Mk III by finishing first and second at New Orleans.  James Weaver finished second in the Drivers Championship, two points behind Ferrari driver Fermín Vélez.
After a successful debut season, several teams purchased Mk IIIs for 1996.  General Motors instigated the use of Oldsmobile Aurora V8s by the Riley & Scott-backed Doyle Racing, Dyson returned with their two entries.  Doyle Racing immediately showed the potential of the Mk III-Oldsmobile combination by winning both the 24 Hours of Daytona and the 12 Hours of Sebring.  Fighting throughout the season with the various Ferrari and Riley & Scott teams, Doyle won two further events before Dyson Racing ended the season with three straight victories.  Doyle Racing's Wayne Taylor earned the WSC Drivers Championship, while Oldsmobile was able to win the Manufacturers Championship.  Doyle's Mk III-Oldsmobile was also flown to Europe that season to participate in the 24 Hours of Le Mans.  The team qualified ninth, but a transmission problem forced the car to retire after fourteen hours.
The 1997 season began for Riley & Scott in the same way the 1996 season had, with a second consecutive victory at the 24 Hours of Daytona, this time earned by Dyson Racing.  Ferrari was however able to prevent a similar repeat win at the 12 Hours of Sebring, but Dyson rebounded with five wins in the nine remaining races in the 1997 season to win the WSC Teams Championship.  Dyson's Butch Leitzinger won the Drivers Championship and Ford secured the Manufacturers Championship, giving Riley & Scotts a clean sweep of the series.
Riley & Scott Mk III