Auto stop/start

Anything non model specific but still BMW related goes here.
Post Reply
BMW Enthusiast
Posts: 2
Joined: 22 Jan 2018, 08:53
Car model: Honda Civic
Location: St Albans

Auto stop/start

Post by longitude » 11 Apr 2018, 18:49

I've recently purchased a diesel X1 which I absolutely love. It's taken a while to get my head round all the features and toys that come with a BMW(my first) but that's all a part of new ownership.
I've not had a car before where the engine stops and restarts when pulling away and I wonder whether a/ does it make that much difference to fuel consumption and b/ will it shorten the life of the starter motor or battery? Any thoughts?

User avatar
Posts: 9002
Joined: 14 Oct 2011, 20:55
Car model: E46 330ci Vert
Location: Northwood
Location: Northwood, Middlesex

Re: Auto stop/start

Post by Metroreg » 11 Apr 2018, 19:50

@longitude I drive a company skoda has the same tech as the BMWs, it ment to save fuel, but my thinking it uses more fuel to start the car up from the fuel pump.

The Battery when it does goes off the engine some how knows if the battery is starting to get flat or drained and starts the engine back up.


BMW Enthusiasts is a free club for everything BMW related

E46 330ci Vert

Check out our new home page! >> BMW Forum

User avatar
BMW Enthusiast
Posts: 637
Joined: 15 Oct 2011, 21:58
Car model: 2016 BMW 116 D MSport
2007 Mini Cooper 1.6 Auto
Location: Stoke-on-Trent

Re: Auto stop/start

Post by Bin-The-L-Plates » 11 Apr 2018, 23:25

Good question and it seems the motoring press are divided....... ... r-s-engine

John Cadogan, is also worth a read or watch on YouTube, he’s an Aussie and not afraid to speak his mind, so another interesting point of view. ... rt-systems

As a driving instructor my pupils love fact that if they stall the car putting in neutral restarts it, however they hate the ‘panic’ of having to ‘restart’ the engine at traffic lights even though its no different to putting it in neutral in a car without stop/start.
I guess the engine restart noise is the key to their anxiety rather than having to put the car back into gear, maybe it’s the misconception that they’ve more to do before getting the car moving.

Does it save fuel........ don’t know and I guess i’ll never know. Done 32,000 miles in 12 months in my F21 116d M Sport and has cost me around £3,600 in fuel (doing around 48mpg @ £5.40/gall) if it saves £10 or 100 odd miles worth of fuel would I notice it over that mileage ?
Wear and Tear........ Who knows until a component fails, nothing so far.
Probably the only thing you can definitely say is it saves on emissions, which is no bad thing.
Also, I actually like to sit in silence in a queue, sadly it’s rudely interrupted when the fairly refined for a diesel engine rattles back into action........

Discount rates for BMW Enthusiasts Forum Members

User avatar
Site Owner
Posts: 23254
Joined: 12 Oct 2011, 13:22
Car model: 135i M Sport
Isetta 300
Location: Bucks
Location: Buckinghamshire

Re: Auto stop/start

Post by M60NJP » 12 Apr 2018, 07:35

I've driven a few but never owned one.

I hate them and until the rules were changed, used to turn it off.

The batteries on SS cars are huge and cost a fortune - upwards of £250 so are well up to the job (not fun when they need replacing though!). AFAIK, the starter is pretty standard, so in theory it will wear quicker.

SS was meant to reduce pollution from idling vehicles so as per Metroreg, never seen any consumption advantage at all.

Crap and pointless eco-bollox in my view!

User avatar
BMW Enthusiast
Posts: 11091
Joined: 17 Oct 2011, 14:24
Car model: '98 E36 323iSE Touring
'12 F31 330d Touring
Location: Reading, Berks.

Re: Auto stop/start

Post by Gus247 » 13 Apr 2018, 15:34

My old company car had it and now my F31 also has it too. It doesn't really bother me TBH except if I'm traffic where I now that the going will be stop/start (pardon the pun), in which case I simply press the button to disable it.

There is a way this can be coded out to always remain inactive if it's something you feel you'd rather not have.

aka Andy


BMW Forum UK

Post Reply

Return to “General BMW”