17 Subaru Outback 3.6 120k; Pennzoil Plat 5-30 7,355 OCI (Compare with Mobil 1 5-30)

Dec 28, 2011
This is the 6th UOA on 17 3.6 Outback. the 5 previous UOA's have been Mobil 1 5-30. Mobil 1 5-30 has been used from the first OC at less than 2k miles on the unit to a little over 100k miles. A stash of Pennzoil Plat 5-30 was obtained so now there is a relative apple-to-apple comparison. Pennz Plat wear numbers look really good but the lower viscosity is present.

I'd love to hear everyone's thoughts on this. My driving habits are pretty consistent. Filter changed at OCI with Fram Ultra. To date, excluding factory Subaru filter Fram Ultra has only been used.

What would be your comfort level for the next OCI?

17 Sub OB Oct 2022.jpg