Originally Posted by Z K
TWS thins down after driving a while. Redline seems to hold its weight better. Mixing in 1 quart of lower weight oil with Redline 10W60 seems like a good idea to get closer to TWS.
Someone should send in a sample of virgin redline 5W50 and 10W60 to see how the SUS Viscosity @ 212*F compares to TWS.
IMO if the 5W50 has a similar viscosity @ operating temp, then the benefit of the lighter base weight for cold starts and flow would just be huge positive. radiatorjoe? uses a blend of redline 40W and 5W30 with great blackstone reports but it's quite a bit lower SUS V than TWS. (68-73 vs. TWS's ~87).