I read in a forum that 0-30 Mobil One is lighter than 5-30 and will add a couple of horses but the down side is oil pressure is down also which MIGHT affect the protection threshold that is acceptable.

This may not be the proper forum but I would appreciate any feedback...

 

mobile 1 0w-30 ADVANCED FUEL ECONOMY is made to sheer.

when looking for an oil, look for a high HTHS(High Temperature High Sheer) rate.
M1 0w-30 has a HTHS rate of 2.99%
this means that it will sheer as soon as you pour it in.
and the claim of fuel economy rising, is minimal. maybe 1 mpg.
I've tried this oil in my '06 TL. I do lots hard driving, and decided that the HTHS rate is to low. I also did not see an increase of gas mileage.

I've moved to M1 0w-40 with a HTHS rate of 3.8%
to compare, Redline 5w-30 has a HTHS rate of 3.99%