Bror Jace

Mobil 1 is typically formulated a bit thinner than other oils in the same viscosity range ... and being a true Group IV PAO synthetic (last I heard) it will have an even lower viscosity at lower temps. All of this could allow a slightly higher idle speed at start-up.

But it's likely the increasingly colder temps.

Moddiction

No need to reset the ecu lol. Sounds normal to me..

EOE

You are FINE. No worries.

SgtB

Still won't raise the idle. The ECU targets a specific rpm and will add and subtract fuel to hit it.

Bror Jace

SgtB, I (and the original poster) were thinking it was the other side of the coin ... a thicker oil, or one with poorer cold-flow properties, would be a heavier drag on the motor and prevent the engine from reaching its target idle speed.

barrett4bama

dude just dont worry. I promise its normal, thats exactly where mine has idled all year, no matter the temp. It goes away after the car starts warming up, what some stupid replies. IF it didnt idle that high before, my guess is that it did, but if it didnt then somebody probably had oil that would had to have been WAYYYY too thick to affect idle speed.

barrett4bama

also there is nothing wrong with mobil 1 oil, been using it for years.

H22toF20

Oil has nothing to do with cold start rpm. S2k's idle at 2k when cold, end of discussion.

SpitfireS

If your engine doesn't reach 2k rpm because of oil.... you have a serious problem.

Bror Jace

OK guys, I guess it's leftover thinking from the days when vacuum ran everything and idle speed could be affected by something like weight, etc ... of oil.