Originally Posted By: kschachn
Can you explain how an additive would change the idle speed on a modern car? Isn't this controlled by the IACV among other things? How would the friction qualities of the oil make a difference, especially when you consider how small the friction difference must be?
To me this is like the temperatures going down when that is controlled by the thermostat. How exactly would an engine oil additive change the idle speed?
Originally Posted By: domer10
Can you explain how an additive would change the idle speed on a modern car? Isn't this controlled by the IACV among other things? How would the friction qualities of the oil make a difference, especially when you consider how small the friction difference must be?
To me this is like the temperatures going down when that is controlled by the thermostat. How exactly would an engine oil additive change the idle speed?
Originally Posted By: domer10
Vikas said:Car has 60000 km 36000 mi, always use shell vpower in the m3, I used sea foam 2 tanks ago, felt nothing....not sure if it did or did not clean internals. This stuff, used a syringe inserted it to tank, drove to gas station about 2 miles away, filled up....was at just over half a tank. After station drove around for about 6-7 minutes, was at stop light and could tell revs were fluctuating for a moment, then stayed steady at about 1000-1100, before it was always 900-1000.....from that acceleration on, noticed far more pep in same amount of throttle that before would not yield same result. This wasn't typical placebo but dyno, I never get that effect because I don't believe adding sea foam or techron or all that stuff will yield a noticeable result. And I have yet to add the 9100 friction modifier.
That's exactly where I was heading. Even if the idle speed was to increase due to some attribute of the additive, the computer and related components would quickly adjust it down.