4th UOA. Switched from Castrol Edge 0W-40 A3/B4 used in all previous OCI's.
Almost right after the change went on a 3800 mile round trip to Tucson, AZ, including a 200 mile round trip to Phoenix while there.
Same Mazda RX-8 (N3R1-14-302) Tokyo Roki Filter since acquiring the vehicle with 108,540 miles on Nov 20, 2020.
1333 mi into OCI:
Significant differences, especially between viscosity. Sampled with motor cold for the first time - let drain for several seconds then filled vials one after another. Can't see that explaining this though.
Almost right after the change went on a 3800 mile round trip to Tucson, AZ, including a 200 mile round trip to Phoenix while there.
Same Mazda RX-8 (N3R1-14-302) Tokyo Roki Filter since acquiring the vehicle with 108,540 miles on Nov 20, 2020.
1333 mi into OCI:
- Cobb Stage 1 + SF ACN91 v400 Map
- TC-W3 640:1 (Pennzoil Marine Premium Plus) + Red Line SI-1 2.5oz
Significant differences, especially between viscosity. Sampled with motor cold for the first time - let drain for several seconds then filled vials one after another. Can't see that explaining this though.
Last edited: