240sx - Nissan OEM oil filter, 4qts of Quaker State conventional

DC4 - Honda OEM oil filter (small one), 4qts of Quaker State conventional

In the past (for the KA24DE and B18B1), I've used High Mileage variants from Valvoline and Castrol, and conventional ones from the same two brands.

I didnt see any drops in oil consumption for the high mileage variants, or any increases in mileage etc.

However, the reason why I go with Quaker now, is that I've seen a significant difference in consumption, plus it was the oil I had analyzed in the 240sx, and it was found that I can go 5000 miles at least between oil changes.

I just changed the oil in both cars, so I'm going to be sending out samples for analysis to see how they fared.