Just put in the Altima in my sig(June 10th 2021), Valvoline NextGen Conventional 5W20, date code 2017. I bought it at PepBoys last Aug. 2020 for a $1/qt.
Drove this past weekend from ROC to State College, PA(250 miles) and the engine is smooth & quiet. Extra quiet in fact. Hmmm!
The NextGen replaced my winter OCI(RGT 0W20) from Nov. 15th 2020/6K miles, ~7 months. It too was nice...NIIIICE!
I'll use this NextGen until Autumn(close to Thanksgiving) and change again to a full synthetic for the winter. It may see 4K miles only 'cause I'll be driving the Firebird and my daughter's Civic(in sig) as well.