Oil leak?

So I just got an oil change and they told me I have some residual oil and told Me it could be a possible rear main seal leak.i have no oil in my driveway and park in the same spot everyday.just wanna know if anyone else had this problem and how much/and how can I find out where the leak is coming from.

 

Clean the area where the oil is and see if it comes back.

 

Have a look at the underside of your truck. Do you see any obvious signs of oil leakage? From what I've seen on here, a rear main leak causes oil to drip from the inspection hole on the transmission bell housing, right where the tranny bolts up to the engine.

 

thank ya will do that asap.hope its not gonna end up being a big issue