I'm curious as to why they do that also, since every batch of Schaeffer Oil I've gotten has been closer to 10cst. I'd probably still be using their 5w30 in my Firebird if I had gotten a batch that was 12cst, as I feel this is the viscosity I truly need for my looser clearance LT1. I believe 10cst is too thin for this engine, especially with the high oil temps I see, and 90k on the motor.
This oil will work out perfectly in a Honda Civic though, so it will be going into my sister's car next interval (when she sells it to my mom) and it will most likely go into my wife's Honda when I'm finished testing Royal Purple.
[ August 24, 2003, 08:26 PM: Message edited by: Patman ]