Who here waits for 750rpm?
Thread Starter
Super Member
Joined: Sep 2005
Posts: 669
Likes: 28
From: Little Falls, NJ
2020 GLC300 4MATIC
Who here waits for 750rpm?
So, I'm not sure if anyone even noticed, but when the car first starts the engine RPMs are higher than normal with this car (they were with my W203 as well).. somewhere in the 1250rpm range... within a few minutes it settles down to 750, and then I get going. Does anyone else do the "waiting game" to make sure the car is happy before driving off, or do you just step on the peddle and go 
?
Just curious who here does what when starting their car...
?Just curious who here does what when starting their car...
Super Member
Joined: Nov 2008
Posts: 604
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From: SA
2008 C350-Sport-AMG-Active Agility Pack(Not reliable) +Izuzu KB6 3L(It seems Reliable)+Mazda
Me
Me waits, usually take a min, just make sence to me for oil to load properly, my temps usually between 16 to 25c. After 5000Km my car sound exactly as the 1st day, maybe a bit softer.
Super Member
Joined: Nov 2007
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From: nyc
528i, GLK
All the cars I've owned does this, at various RPM. I usually wait or if time allowed, stroll slowly for about 5-10mins. Gives the chance for the oils to breakdown and lube all around, especially during new york winters.
Out Of Control!!
Joined: Nov 2005
Posts: 18,677
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From: OC
a quarter mile at a time
As I understand it, extended periods of idle warm up isn't necessary with newer cars unless you live in an overly cold climate. The higher idle when you start the car is to bring up the catalytic converters to operating temperatures. Best to let the engine start, idle for a few seconds, and then drive easy for the first couple miles.
Super Member
Joined: Dec 2007
Posts: 648
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From: Seattle
C-300, XC70, Wrangler
I was going to blow this topic off but remembered it when I backed the car out of the garage this morning. My typical approach is to start the engine, check the mirrors, and start moving. This time I watched the tach too.
4, maybe 5 seconds at the high rpm, put it in Reverse, backed out the 20 ft, and it was idling at normal speeds (below 750). Very short high-speed idle. Then I shut off the engine. It will sit for a few hours before the commute this morning. (Why back it out ... garbage day, gotta get at the cans. Ugh.)
4, maybe 5 seconds at the high rpm, put it in Reverse, backed out the 20 ft, and it was idling at normal speeds (below 750). Very short high-speed idle. Then I shut off the engine. It will sit for a few hours before the commute this morning. (Why back it out ... garbage day, gotta get at the cans. Ugh.)
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Senior Member
Joined: Jun 2004
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From: Mission Viejo, California
2008 c350 SG - 2004 c240 Wagon BS
Having owned air-cooled Harley Davidsons for many years I got used to warming them up before taking off. It is required if you want them to last reliably.
On my cars, I do wait 30 seconds or so before taking off even though most Southern California mornings are rather mild. If I lived in a freezing climate I would wait until the heater starts working.
I feel it's important to allow the metal components to realize some lubrication and warming before stressing the drivetrain. I typically keep my purchased cars for 15 years and 150,000 to 200,000 miles.
On my cars, I do wait 30 seconds or so before taking off even though most Southern California mornings are rather mild. If I lived in a freezing climate I would wait until the heater starts working.
I feel it's important to allow the metal components to realize some lubrication and warming before stressing the drivetrain. I typically keep my purchased cars for 15 years and 150,000 to 200,000 miles.
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From: nyc
528i, GLK
Excess idling is not good because it generates build ups from unburned fuel.
But with a cold start, you will typically see a late shift (1st to 2nd) and jerkiness. Getting the lubes warmed up is important, especially in cold climate. The viscosity of the motor oil today is design to have less warmup time. However, these properties deteriorates over time and usage. This is one of the benefits claimed by synthetic oils.
MBWorld Fanatic!
Joined: Dec 2007
Posts: 2,052
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From: Vancouver, BC
2008 Mercedes C300 4Matic
I've heard that before but have not see any evidence of that claim. What makes cars today better at start-n-go? are we talking about vs cars 30 yrs ago before fuel injection time?
Excess idling is not good because it generates build ups from unburned fuel.
But with a cold start, you will typically see a late shift (1st to 2nd) and jerkiness. Getting the lubes warmed up is important, especially in cold climate. The viscosity of the motor oil today is design to have less warmup time. However, these properties deteriorates over time and usage. This is one of the benefits claimed by synthetic oils.
Excess idling is not good because it generates build ups from unburned fuel.
But with a cold start, you will typically see a late shift (1st to 2nd) and jerkiness. Getting the lubes warmed up is important, especially in cold climate. The viscosity of the motor oil today is design to have less warmup time. However, these properties deteriorates over time and usage. This is one of the benefits claimed by synthetic oils.
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Joined: Oct 2008
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From: Atlanta, GA
2008 C300 Sport 6 Speed Manual, 1953 Chevy Bel-Air, 2015 Audi allroad, 1963 Chevy Apache
I always get in and start the car immediately. Then I adjust the climate control, radio, seat belt, phone, etc, etc. Maybe 30 seconds and the engine is below 1000RPM but not quite 750, then I ease away for the first mile or two. All this excessive idling is actually pretty bad for your car. All the car needs is a few seconds to build oil pressure. Once started, easy driving for the first few miles is the least destructive way to warm a car up...much better than idling...simply Google the facts on this for some interesting reading.
Senior Member
Joined: Aug 2007
Posts: 446
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'08 C 300 Sport, '01 SL 500 & '08 Nissan Frontier SE Crew Cab 4WD
I wait for 750 just because I feel better about it. My main reason though isn't the motor so much as I feel it easier on the A/T and less harsh shifting into reverse or drive at 750 than say the thunk you feel if you do it at 1200 or 900 etc...
-Ryan
-Ryan
Super Member
Joined: Oct 2007
Posts: 811
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From: Toronto, ON
2011 E350 4Matic Wagon, 2013 C350 4Matic Sedan
I usually run the car for about 15 seconds during the summer and 30-60 seconds in the winter. About enough time to get my seatbelt on, radio/navi loaded, and check mirrors.
Junior Member
Joined: Jul 2008
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From: Chesapeake, VA
'08 C300W Lux
