Approx. 15 year old Black Oak in Austin, Tx, that has about an 8 inch crack in one side that appears to be oozing some sap. No discernable smell to the crack or the sap, but the sap appears to have dried up, most likely due to the heat I'm guessing. Also seeing possible evidence of additional pending cracking on the opposite side.

No pruning has been done within the last few years but we did have a mountain laurel that bled out profusely until it died earlier this spring. It oozed sap from all branches but no large cracks like the Oak. It was already half a tree and across the driveway from the oak, so we didn't worry too much, but I'm obviously concerned, considering. I'm wondering if this is a sign of wetwood or other infection, if I should try to seal the crack or if someone might have have an Arborist recommendation.

I would greatly appreciate any suggestions/advice. Thanks!