To Whom It May Concern,

Looked at a 2013 Lexus IS 250 earlier today.  Plugged in the scanner to initially see that there were no default codes.  However, I video recorded when I checked the fuel trims while idling just before I started revving the engine:

At idling:

shrtft1 oscillated between 2.3 - 1.6%

longft1 oscilated between -5.5 - -6.3%

shrtft2 between 3.9 - stayed the same

longft2 b/w -4.7 - stayed the same

While revving the engine:

shrtft1 oscillated between 0 - -14.8%

longft1 b/w -4.7 - -6.3%

shrtft2 b/w 0 - -15.6%

longft2 b/w -2.3 - -4.7

The exhaust pipe also had fresh oil in it when I swiped my finger.

Given my crash course in inspecting used cars, I understand that this means the engine is running rich in oil. How serious of an issue is this?  Is it even worth it to buy?

Thanks again (in advance)!