Let us see those cars / light trucks that have not died yet from a 20 wt. oil. Please do not report unless your car has been run for at least 100 k on a 20 wt. oil. If the car has 150 k and has used 30 wt for less than 50 k then this is OK. We want just those cars that have AT LEAST 100 k of their life with 20 wt. oils.
aehaas
PS It may also be that cars running 10W-30 wt. multi-grade oils from the 1960’s to the 1990’s may qualify as they rapidly became 20 wt. oils after a few hundred miles. Many oils I have tested for initial viscosity actually started out as 20 wt. oils in the 1970’s. That is when I starting using Pennzoil as it started out a 30 wt. as advertised then held grade the longest
aehaas
PS It may also be that cars running 10W-30 wt. multi-grade oils from the 1960’s to the 1990’s may qualify as they rapidly became 20 wt. oils after a few hundred miles. Many oils I have tested for initial viscosity actually started out as 20 wt. oils in the 1970’s. That is when I starting using Pennzoil as it started out a 30 wt. as advertised then held grade the longest