I can off-hand recall Gretzky's 2 (regular season) overtime goals. One was against New Jersey in the 1985-86 season... another was, of course, the 1852 points' game vs. Edmonton when he broke Howe's record in 1989.
Anyway, that made me curious about Gretzky's overtime assists and points.
(Checks) :
Oct. 9th 1983: primary assist on Kurri's OT winner vs. Minnesota (this was the Oilers' first-ever R.S. overtime game)
Mar.13th 1984: secondary assist on Coffey OT winner vs. Quebec
Nov. 17th 1985: primary assist on Napier's OT winner vs. NYR
Jan. 24th 1986: goal in OT vs. New Jersey
Mar. 21st 1986: primary assist on Kurri OT winner vs. Minnesota
Oct.11th 1986: primary assist on Kurri's OT winner vs. Montreal
Feb.4th 1987: secondary assist on Gregg's OT winner vs. Minnesota
Jan. 10th 1989: primary assist on Krushelnyski's OT winner vs. Edmonton
Mar. 7th 1989: secondary assist on Taylor's OT winner vs. Pittsburgh
Oct. 15th 1989: goal in OT vs. Edmonton
Jan.8th 1991: secondary assist on Benning's OT winner vs. Hartford
Mar. 24th 1991: primary assist on Sandstrom's OT winner vs. Edmonton
I'm too lazy to do this further than the 1990-91 season, but anyway that covers Gretzky's prime years. (Someone else complete this if you're so inclined.)
If you're keeping track: Gretzky, from 1983 to 1991, put up 2 goals and 10 assists (12 points) in regular season overtime. That's 12 overtime goals he factored in, out of 30 his team scored, or 40%. That is a little less than his average of points/team-goals, which is somewhat surprising, but I suppose you have to bear in mind that a lot of these games, when he was with Edmonton, were quite meaningless in the standings.
(Weird stat I noticed: In 1984-85, the Oilers failed to win a single overtime game in 12 attempts!)