I can no longer sit back and allow communist infiltration, communist indoctrination, communist subversion, and the international communist conspiracy to thin out and impurify all of our PRECIOUS PETROLEUM FLUIDS
Mandrake, have you ever seen a left coast communist use 15W40? 5W15, that's what they use.
When the manufacturer engineers said oil was too important to be left to the mechanics 50 years ago, they might have been right. But today, oil is too important to be left to engineers. They have neither the time, the training, nor the inclination for long term engine wear past the warranty expiration period!
I first became aware of this during the physical act of starting a car with 200,000 miles.