Just got word that there are some synthetic multigrade oils that are almost like straight weight oil.
They are:
Mobil 1 10W30
Castrol SLX-A3 0W30 (explains why the wear is so low in when it is used)
Redline 5W20 and 10W30
Amsoil ACD 10W30
They are synthetic oil that are like straight weights because their VII is very very low but still qualify as multigrade.
These oil have very high HTHS.