Replaced my CCV grommets and elbows on a 99 Grand Cherokee 4.0 and its heater hoses. Reused the felpro rubber valve cover gasket from last time the valve cover was off in 2014-ish. I'm hoping oil leak (1 qt/5K miles) is from the rear of the valve cover instead of the RMS replaced in 2014... don't want to do that again.
256K miles of whatever cheap 5W-30/10W-30/10W-40 oil, usually changed at 5K miles but a few times went over to 7K. Currently has Quaker State syn blend high mileage at 4.6K miles. Before that, next previous 4 oil changes were with 10W40 HM Pennzoil conventional. I'll change the oil after the dirt that got in from today gets filtered out.