|Statement: || |
The HTHS viscosity is a measure for the performance of an oil under conditions similar as in automotive and heavy-duty engines, namely at high temperature and rotation speed. Stable lubrication can be maintained even under these condition with oils having a sufficient HTHS viscosity. The ACEA sequences for engine oils therefore define limit values for the HTHS viscosity.
The regular HTHS viscosity is >= 3,5 mPas and required in sequences A/B 3,4 und C 3,4. Reduced HTHS viscosity is between 2,9-3,5 mPas and required in sequences A/B 1 und A/B 5. The sequences C1, 2 require a HTHS viscosity >= 2,9 mPas. The lowest HTHS viscosity between 2,6-2,9 mPas is required in sequence C5.