Rene Arnoux drove his turbocharged Renault to an easy victory yesterday at Monza in the 53rd Italian Formula 1 Grand Prix, the penultimate event of the 1982 season.

Ferrari drivers Patrick Tambay and former world champion Mario Andretti placed second and third, respectively

Keke Rosberg, the world driving championship points leader, finished out of the points in eighth place after his car lost its rear wing near the race's midway point.

John Watson was fourth in his McLaren, the highest-placed nonturbocharged car, to keep his hopes alive for snatching the title from Rosberg at the last race of the season in Las Vegas.

Arnoux, who will be driving for the Italian Ferrari team next season, was never threatened after grabbing the lead on the first lap. He drive the race in 1 hour 22 minutes 25.73 seconds, ahead of Tambay by 14 seconds. Andretti, driving a Ferrari on a one-time-only basis, was 48 secons off the pace.

Arnoux completed the 52 laps with an average speed of 136.394 miles per hour . . .

In the Wrangler 400 at Fairgrounds Raceway in Richmond, Bobby Allison almost ran out of gas but was saved by a late pit stop in a decisive victory that padded his point lead in the Winston Cup Grand National stock car standings.

"I was out of gas on that last pit stop," said Allison, who started on the pole, averaged a near-record 82.800 mph in a Chevrolet and prevailed by half a lap of the .533-mile track. It was his seventh Grand National win this season.