- Joined
- Sep 26, 2010
- Messages
- 9,807
Agree--a normally aspirated engine at 7K would see a loss of about 21% HP/TQ vs. at sea level (3% for each 1000' increase in elevation). I know because I live it everyday.I highly doubt that is the reason. Computer controlled engines take into account the ambient pressure and temperature and tune the engine accordingly. So it's not going to "run poorly" with 5W-30 vs 0W-30 when at 7500 ft and -4F. Still sticking with the pumpability issue at those conditions.
However, the 2.7L Ford is a twin turbocharged engine and is minimally affected by altitude (if at all).
Ford's recommendation is totally about the temperature...and they should have used an "or" instead of "and" or left the altitude part completely out of the statement.
I test drove one a few weeks ago and was very impressed with the power over my normally aspirated 3.6L.