Use straight weight in warm weather

[Jelly]

Well, here are a few of Redlines straight-grade racing oils:

SAE 20 (5W20) - for drag racing, circle track qualifying and race engines designed for low-viscosity oils.

SAE 30 (10W30) - suitable in well balanced racing engines for sustained high-speed use where low internal friction is desired.

SAE 40 (15W40) - for use where temperatures may be high and when a wide range in RPMs and speeds will be encountered.

SAE 50 (15W50) - for use where extremely high temperatures may be encountered and when engine durability is the primary concern.

The base oil, as we know, has the inherent ability to flow at a wide range of temperatures without the need of VII's....(duh, we already knew that!)

 

[userfriendly]

It is interesting how marketers can make up a story for every viscosity, type of racing engine, RPM and so on.

Then they throw in the SAE 7 1/2W35s and 000W10s.
What the heck is a 00W30? An engine oil that will allow -80F unassistated cold starts?