The Penske PC-18 was a CART Penske Racing car which was constructed for competition in the 1989 season. The chassis was fielded by two teams, Penske Racing and Patrick Racing.

Rick Mears won the pole position for the 1989 Indianapolis 500 with the car, and Emerson Fittipaldi won the race itself. Fittipaldi went on to win the 1989 CART championship driving the PC-18 chassis.

Eddie Cheever fielded the PC-18 chassis during the 1990 season for the newly formed Chip Ganassi Racing.

Complete Indy Car World Series results

(key) (Results in bold indicate pole position)

Year	Team	Engine	Tyres	Driver	No.	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	Points	D.C.
1989	Team Penske	Chevrolet 265A V8t	G			PHX	LBH	INDY	MIL	DET	POR	CLE	MEA	TOR	MCH	POC	MDO	ROA	NAZ	LAG
				Danny Sullivan	1	3	8	28	10	24			8	3*	23	1	5	1	3	14			107	7th
				Geoff Brabham							14												0	39th
				Al Unser								10											14	16th
					25			24							8	7
				Rick Mears	4	1	5	23	1	5	8	5	4	5	7	2	6	3	2	1			186	2nd
	Patrick Racing	Chevrolet 265A V8t	G	Emerson Fittipaldi	20			1	16	1	1	1	2	2	14	19	4	5	1	5			196*	1st*
1990	Chip Ganassi Racing	Chevrolet 265A V8t	G			PHX	LBH	INDY	MIL	DET	POR	CLE	MEA	TOR	MCH	DEN	VAN	MDO	ROA	NAZ	LAG
				Eddie Cheever	15	7	13		11	3	19				4								80*	9th*
					25			8
	Granatelli Racing	Buick 3300 V6t	G	Tom Sneva	9			30															0	44th
				Didier Theys						13	20	23	28	7		9	25	16					15*	18th*
					70			11
				Kevin Cogan	11			9															4	23rd
1991	Walther Motorsports	Cosworth DFS V8t	G			SFR	LBH	PHX	INDY	MIL	DET	POR	CLE	MEA	TOR	MCH	DEN	VAN	MDO	ROA	NAZ	LAG
				Salt Walther	77				DNQ														-	NC

*Includes points scored by other cars.