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There was a huge drop in flashpoint and viscosity in the previous sample on Mobil1 AFE 0w20 which was even shorter in mileage, but also 6 months. I was planning on annual oil changes on this car given the mileage, but I'm glad I sampled it at 6 months. Although this sample on Pennzoil was much...

Mostly all stop and go in NYC. 26 weeks. April-Oct. Fram Ultra. Driven hard. 5 mile, 20 minute commute 2x daily. Previous report on 4/9/22 was winter months on Mobil 1 AFE 0w20. This one was PUPPP 5W30 for summer. Current fill is Mobile AFE 0w30 due to fuel dilution that occurred with AFE 0w20.

For summer fill I went with PUPP 5w30. Noack is a bit high at 11.5 on this one, but with D4S, I don't think it'll be much of an issue. Maybe I should go 5w30 year round due due the loss of viscosity from short trip fuel dilution. Is there a low Noack 5w30? I use Amsoil for my Camaro's annual...

Correct.

How can you tell there is fuel? By looking at flashpoint and viscosity? My concern of fuel dilution was the main reason I drained it at 6 months.

Mostly all stop and go in NYC with a 400 mile highway trip. 26 weeks. Oct-april. Fram Ultra. Driven hard. 5 mile, 20 minute commute 2x daily.