Leo DiCaprio's Lexus For Sale On eBay ... It's Where Gisele Sat!

A guy selling a Lexus on eBay is banking on you paying more because Leo DiCaprio cavorted with Gisele Bundchen and other models in the whip.

A guy named Brian bought the 1999 Lexus GS 400 at a dealership. The paperwork showed Leo was the prior owner who turned it in after the lease expired.

Brian bought the car in 2001 with 18,000 miles. He's selling it today with 148,091 miles, and you can buy it now for $20,000.

So how can he command such a price? Brian tells TMZ ... the former service manager at the Beverly Hills dealership told him Gisele was a passenger in the car several times when Leo dropped it off for service.

In other words ... sniffing the seat comes at a premium.

Here's the bad news for Brian ... The stale scent of a woman doesn't command lots of cents -- top bid so far is $5,000.