Here's one for you Scotty since you're a big Toyota fan and for whoever wants to chime in.
I took my 2013 Toyota Corolla that has 56K miles into the dealership solely to do the Takata airbag recall. Went home and got a call a few hours later from my service adviser that the work was finished. However, he let me know that he suspects a possible timing cover issue because there's oil seepage around the lower part of the timing cover near the timing chain tensioner and crank pulley. He pointed it out to me in the parking lot. All I saw was a single bolt covered in oil residue. He said the dealership will replace the timing cover gasket at no cost because my car is still covered under the powertrain warranty up to 60K miles. He also said it's a "known" issue with this engine and wants to take care of it before it becomes a problem.
As far as I know, my car is in tip top shape. I change the oil/filter with synthetic oil religiously every 5K miles/six months. No oil loss in between changes. Car runs perfectly fine. I'd say a good 60% or more of the miles are from highway use. What I'm worried about is not about the cost but to have unnecessary work done to my car that poses a greater risk of doing more harm than good. I understand it's a big job just to fix something so minuscule or something that may be completely normal. I'm just at a crossroads on what to do. I don't want to have to come back to the dealership (naturally when the warranty expires) because of issues they may have created from this job at my cost. I attached some photos to clarify what they believe is something that would be an "issue" shortly in the future.
Thank you for your opinions and advice! Cheers.
"Timing chain tensioner area at the lower part of the timing cover"
"Bolt next to timing chain tensioner/crank pulley that was pointed out to me by the service adviser"