Originally Posted By: SR5
Wemay,
My last oil fill was an ILSAC GF-5 oil M1 5W30. My next oil, the one in there now, is a Euro A3/B4 Penrite 10W40.
My car is a NA 4-cylinder, port injected. I noticed no change in responsiveness with the change in oil.
Previous to the M1 5W30, I was using SynPower 0W40. Same deal, I didn't notice any change.
Not saying I disagree with you. Just there was no noticeable change for me.
However, if I step up the fuel grade to the next octane level up, I do notice that the car becomes more responsive and feels a touch more peppy. According to the original specs, I should get about a 3% increase in power stepping it up to premium fuel as my car can change it's ignition advance in response to changes in fuel quality.
I hear ya SR5
I'm not sure if maybe the 3.7 HTHS is the reason or what, but yes, definitely a difference.