Originally posted by xdouble:
There is a higher pressure because the oil is not flowing as well; if it isn't flowing as well, it would lead you to believe that your parts aren't getting lubricated as well. I would stay with the 5w30 myself.


Exactly!

Higher oil pressure DOES NOT mean better oil flow, volume or protection.

In this case it just means more resistance to being able to flow. Which is a bad thing!
Especially at startup and high rpms. Those are 2 areas I definitely would not want degraded oiling ability and protection.


Then top it off with the extra parasitic drag of running the nearly twice as thick oil!!!

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.