Pos	Date	Race	Entrant / Team	Chassis	Championship	Time/DNF
DNF	1994-10-01	1994 IMSA Exxon Supreme GT Phoenix		Porsche 911 Turbo	IMSA
25	1993-07-24	1993 IMSA Monterey Camel GT 1 Hour	Oest Enterprises Racing	Porsche Carrera RSR	IMSA	Mechanical
DNF	1990-04-21	1990 IMSA Long Beach 1 Hour GT	Oest Enterprises Racing	Porsche 911 Turbo	IMSA	Engine
DNF	1987-02-01	1987 IMSA Daytona 24 Hours	SP Racing	Porsche 911	IMSA	Engine
14	1976-07-10	IX Watkins Glen 6 hours	Private entry	Porsche 911 Carrera RSR	World Sportscar
10	1976-03-20	XXIV Sebring 12 hours	Oest-Tillson Racing	Porsche Carrera	IMSA
5	1976-01-31	XI Daytona 24 hours	Private entry	Porsche Carrera	IMSA
16	1975-03-21	XXIII Sebring 12 hours	Oest-Tillson Racing	Porsche Carrera	IMSA
11	1975-02-01	X Daytona 24 hours	Private entry	Porsche 911 Carrera RSR	World Sportscar
18	1974-09-02	1974 IMSA Lime Rock (Race 2)	Oest-Tillson Racing	Porsche 911	IMSA
27	1974-09-02	1974 IMSA Lime Rock (Race 1)	Oest-Tillson Racing	Porsche Carrera RSR	IMSA
DNF	1974-07-13	VII Watkins Glen 6 hours	Private entry	Porsche 911 Carrera RSR	World Sportscar	Engine
17	1974-06-30	1974 IMSA III Annual Mid-Ohio Twin 6s	Oest-Tillson Racing	Porsche 911S	IMSA
16	1974-04-21	1974 IMSA 6 Hours Road Atlanta	Oest-Tillson Racing	Porsche 911S	IMSA
DNF	1973-09-15	1973 IMSA Lime Rock (Race 2)	Holbert Racing	Porsche 911	IMSA	??
DNQ	1973-07-21	VI Watkins Glen 6 hours	Holbert Racing	Porsche 911S	World Sportscar
12	1973-07-15	1973 IMSA Mid-Ohio 6 Hours	Holbert Racing	Porsche 911S	IMSA
DNF	1973-07-15	1973 IMSA Mid-Ohio 6 Hours	Holbert Racing	Porsche 911S	IMSA	??
21	1973-06-16	1973 Trans-Am Watkins Glen	Holbert Racing	Porsche 911	Trans-Am
12	1973-06-10	1973 IMSA Pocono 500 Miles	Holbert Racing	Porsche 911S	IMSA
11	1973-05-05	1973 Trans-Am Lime Rock	Oest-Tillson Racing	Porsche 911	Trans-Am
DNF	1973-04-21	1973 IMSA Daytona 3 hours	Holbert Racing	Porsche 911S	IMSA	??
10	1973-03-24	XXI Sebring 12 hours	Holbert Racing	Porsche 911S	IMSA
DNF	1973-02-03	VIII Daytona 24 hours	Holbert Racing	Porsche 911S	World Sportscar	??
8	1972-09-10	1972 IMSA Watkins Glen 500Kms	Holbert Racing	Porsche 911S	IMSA
DNQ	1972-07-22	V Watkins Glen 6 hours	Holbert Racing	Porsche 911 Turbo	World Sportscar
16	1972-07-09	1972 IMSA Mid-Ohio 6 Hours	Holbert Racing	Porsche 911T	IMSA
DNF	1972-04-16	1972 IMSA Danville 250 Miles	Holbert Racing	Porsche 911T	IMSA	??
16	1972-03-25	XX Sebring 12 hours	Holbert Racing	Porsche 911 Turbo	World Sportscar
8	1971-09-19	1971 IMSA Summit Point 250 Miles	Private entry	Porsche 911	IMSA
DNQ	1971-01-30	VI Daytona 24 hours	Dieter R. Oest	Lancia Fulvia Rallye	World Sportscar
DNF	1970-01-31	V Daytona 24 hours	Private entry	Lancia Fulvia HF	World Sportscar	Engine
DNF	1969-07-12	II Watkins Glen 6 hours	Auto Enterprises	Porsche 904 GTS	World Sportscar	Accident
41	1969-03-22	XVII Sebring 12 hours	Auto Enterprises	Ford GT40	World Sportscar
DNF	1969-02-01	IV Daytona 24 hours	Private entry	Lancia Fulvia HF	World Sportscar	Gearbox
DSQ	1968-07-14	I Watkins Glen 6 hours	Private entry	Porsche 904 GTS	World Sportscar	Too Slow
DNS	1968-03-23	XVI Sebring 12 hours	Private entry	Porsche 356B Carrera 2	World Sportscar	Engine

Class

Pos	Class	Date	Race	Entrant / Team	Chassis	Championship
DNF	GTS	1994-10-01	1994 IMSA Exxon Supreme GT Phoenix		Porsche 911 Turbo	IMSA
DNF	GTU	1993-07-24	1993 IMSA Monterey Camel GT 1 Hour	Oest Enterprises Racing	Porsche Carrera RSR	IMSA
18	GTO	1990-04-21	1990 IMSA Long Beach 1 Hour GT	Oest Enterprises Racing	Porsche 911 Turbo	IMSA
DNF	GTU	1987-02-01	1987 IMSA Daytona 24 Hours	SP Racing S	Porsche 911	IMSA
4	Gr.4	1976-07-10	IX Watkins Glen 6 hours	Dieter Oest	Porsche 911 Carrera RSR	World Sportscar
9	GTO	1975-02-01	X Daytona 24 hours	Dieter Oest	Porsche 911 Carrera RSR	World Sportscar
DNF	GT	1974-07-13	VII Watkins Glen 6 hours	Dieter Oest	Porsche 911 Carrera RSR	World Sportscar
DNQ	GT	1973-07-21	VI Watkins Glen 6 hours	Holbert Racing S	Porsche 911S	World Sportscar
DNF	GT	1973-02-03	VIII Daytona 24 hours	Holbert Racing S	Porsche 911S	World Sportscar
DNQ	GT	1972-07-22	V Watkins Glen 6 hours	Holbert Racing S	Porsche 911 Turbo	World Sportscar
10	GT	1972-03-25	XX Sebring 12 hours	Holbert Racing S	Porsche 911 Turbo	World Sportscar
DNQ	Touring	1971-01-30	VI Daytona 24 hours	Dieter R. Oest S	Lancia Fulvia Rallye	World Sportscar
DNF	Touring	1970-01-31	V Daytona 24 hours	Dieter Oest	Lancia Fulvia HF	World Sportscar
DNF	S2.0	1969-07-12	II Watkins Glen 6 hours	Auto Enterprises S	Porsche 904 GTS	World Sportscar
3	S5.0	1969-03-22	XVII Sebring 12 hours	Auto Enterprises S	Ford GT40	World Sportscar
DNF	GT	1969-02-01	IV Daytona 24 hours	Dieter Oest	Lancia Fulvia HF	World Sportscar
DSQ	S2.0	1968-07-14	I Watkins Glen 6 hours	Dieter Oest	Porsche 904 GTS	World Sportscar
DNS	GT	1968-03-23	XVI Sebring 12 hours	Dieter Oest	Porsche 356B Carrera 2	World Sportscar

Fastest Laps

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Pole Positions

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Wins

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Standings

Position	Championship	Year
31	IMSA SportsCar	1976

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