^^^There ARE
large variances in the
actual viscosities of the thousands of 5W-30s out there.
Red Line 5W-30 (the original, highly additized, 'good stuff' in the white concal bottle) is MUCH thicker in HTHSV (
High
Temperature
High
Shear
Viscosity), at ~3.8 HTHSV, than let's say Ravenol DXG 5W-30 ( at~3.0 HTHSV), or any of the on the shelf at Wal Mart 5W-30s, some of which are UNDER a 3.0 HTHSV.