Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Team | Chassis | Engine | Tires | Drivers |
| --- | --- | --- | --- | --- |
| Sugaripe Prune | McLaren | Cosworth | G | Tom Sneva |
| Chaparral Cars Inc. | Chaparral | Cosworth | G | Johnny Rutherford |
| Team Penske | Penske Phoenix | Cosworth | G | Rick Mears |
| Team Penske | Penske Phoenix | Cosworth | G | Bobby Unser |
| Team Penske | Penske Phoenix | Cosworth | G | Mario Andretti |
| Team Penske | Penske Phoenix | Cosworth | G | Gordon Johncock |
| Team Penske | Penske Phoenix | Cosworth | G | Tom Gloy |
| Patrick Racing | Penske Wildcat Phoenix | Cosworth | G | Gordon Johncock |
| Patrick Racing | Penske Wildcat Phoenix | Cosworth | G | Tom Bagley |
| Patrick Racing | Penske Wildcat Phoenix | Cosworth | G | Gordon Smiley |
| Fletcher Racing | Penske Phoenix | Cosworth | G | Spike Gehlhausen |
| Fletcher Racing | Penske Phoenix | Cosworth | G | Gordon Smiley |
| All American Racers | Eagle | Cosworth | G | Mike Mosley |
| Longhorn Racing | Longhorn | Cosworth | G | Al Unser |
| Alsup Racing | Penske McLaren | Cosworth | G | Bill Alsup |
| Alsup Racing | Penske McLaren | Cosworth | G | Phil Caliva |
| Galles Racing | Penske McLaren | Cosworth Chevrolet | G | Dick Ferguson |
| King Racing | McLaren King | Cosworth Chevrolet | G | Roger Mears |
| King Racing | McLaren King | Cosworth Chevrolet | G | Billie Harvey Jerry Miller |
| 1st National Bank of Peru | Anteres | Offy | G | Jan Sneva |
| Hoffman Racing | Penske Lightning Spyder | Cosworth Offy | G | Joe Saldana |
| Hoffman Racing | Penske Lightning Spyder | Cosworth Offy | G | Bob Frey |
| Stanton Barrett | Penske | Cosworth | G | Ron Shuman |
| Mergard Racing | Eagle | Offy | G | John Wood |
| Leader Card | Watson | Offy Cosworth | G | Billy Vukovich II |
| Leader Card | Watson | Offy Cosworth | G | Sheldon Kinser |
| Menard Racing | Lightning | Offy | G | Herm Johnson |
| Wood Power | Eagle | Chevrolet | G | Bill Tempero |
| Alex Foods | Penske | Cosworth | G | Pancho Carter |
| Del Ray Marine Agajanian-Faas | King | Chevrolet | G | Bob Harkey Tony Bettenhausen Jr |
| The Enterprise | Wildcat | Offy | G | Ross Davis |
| Pacific Coast Racing | Penske Lightning | Cosworth Offy | G | Rick Muther |
| Pacific Coast Racing | Penske Lightning | Cosworth Offy | G | Al Loquasto Jeff Heywood |
| Gilmore Racing | Parnelli | Cosworth | G | A.J. Foyt |
| Gilmore Racing | Parnelli | Cosworth | G | George Snider |
| Armstrong Mould O'Hanlon Racing | Wildcat Lola Orbiter McLaren March | DGS Cosworth Chevrolet | G | Jerry Sneva |
| Armstrong Mould O'Hanlon Racing | Wildcat Lola Orbiter McLaren March | DGS Cosworth Chevrolet | G | Tom Bigelow Howdy Holmes Danny Ongais |
| Armstrong Mould O'Hanlon Racing | Wildcat Lola Orbiter McLaren March | DGS Cosworth Chevrolet | G | Greg Leffler |
| Armstrong Mould O'Hanlon Racing | Wildcat Lola Orbiter McLaren March | DGS Cosworth Chevrolet | G | Gary Bettenhausen |
| Armstrong Mould O'Hanlon Racing | Wildcat Lola Orbiter McLaren March | DGS Cosworth Chevrolet | G | Bruce Hill |
| Armstrong Mould O'Hanlon Racing | Wildcat Lola Orbiter McLaren March | DGS Cosworth Chevrolet | G | Cliff Hucul Lee Kunzman |
| Interscope Racing | Parnelli | Cosworth | G | Danny Ongais |
| Richmond Racing Mach I Racing | Penske | Cosworth | G | Tim Richmond |
| Beaudoin Racing | McLaren | Cosworth | G | Billy Engelhart |
| Sun Systems | Penske | Cosworth | G | Bill Whittington |
| Sun Systems | Penske | Cosworth | G | Don Whittington |
| Scientific Drilling | Penske | Cosworth | G | Dennis Firestone |
| Guarantee | Lightning | Chevrolet | G | Hurley Haywood |
| Tonco Trailer | McLaren Gerhardt Karl | Chevrolet | G | Jerry Karl |
| Simon Racing | Vollstedt | Offy | G | Dick Simon |
| Advance Clean Sweep | Wildcat | Chevrolet | G | Roger Rager |
| McElreath Racing | Penske | Cosworth | G | Jim McElreath |
| Hopkins Racing | Lightning | Offy Cosworth | G | Johnny Parsons |
| Kraco Racing | Wildcat | DGS Offy | G | Larry Cannon |
| Vetrock Racing | Eagle | Offy | G | Dean Vetrock |
| Machinists Union | IAM | Chevrolet | G | Phil Threshie Larry Dickson |
| Cargo Master | Manta | Offy | G | Dick Ferguson |
| Parts Washer Service | Eagle Penske | Offy | G | Chip Mead |
| Parts Washer Service | Eagle Penske | Offy | G | John Mahler |
| Texaco Star | Lightning | Offy | G | Janet Guthrie |
| Vita Fresh Orange Juice Medlin Racing | Eagle | Offy | G | Tony Bettenhausen Jr |
| Wysard Motor Co. | Wildcat McLaren | DGS Cosworth | G | Vern Schuppan Pete Halsmer |
| J J Enterprises | Wildcat | Cosworth DGS | G | John Martin |
| BFM Enterprises | Manta | Offy | G | Milt Harper |
| National Engineering | McLaren | Cosworth | G | Michael Chandler |
| Walmotor | Penske | Cosworth | G | Salt Walther |
| Pronosticos Deportivos | Penske | Cosworth | G | Daniel Muñiz |
| -Private Entry- | Penske | Cosworth | G | Juan Carlos Bolaños |
| Shade Tree Racing | Eagle | Offy | G | Michel Jourdain |
| Psachie | Penske | Cosworth | G | Josele Garza |
| Rhoades Racing | Eagle | RAM | G | Larry Rice |
Question:
What engine does Chip Mead of Parts Washer Service use?
Answer:
Offy