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Re: cold reading dipstick
#189158
11/09/2006 10:52
11/09/2006 10:52
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Anonymous
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Anonymous
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I do notice a slight difference between the 'morning check' and the hot-check.
about 1/4 of the dipstick markings.
cheers. .
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Re: cold reading dipstick
#189159
11/09/2006 12:53
11/09/2006 12:53
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Anonymous
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Anonymous
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Well over half a litre in my case, why it should be different I have no idea. If I want to feel happier about the oil consumption, I check it cold - if I want the real picture and can take the frightening guzzling, I check it warm like you're supposed to.
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Re: cold reading dipstick
#189160
11/09/2006 14:46
11/09/2006 14:46
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Anonymous
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Anonymous
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I've always wondered this as well - everyone seems to say that you check when its warm but the handbook doesn't say that - just to wait 10 mins after stopping to let it settle.
Surely when you are dipping something into a liquid to test its depth the most accurate way is to wait until its completely cooled and settled - to actually design a gauge that works when the oil is warm and have it be acurate would be a nightmare.
When you take into consideration the different types, thickness, and makes of oil that are used and that fact that different oils take different times to cool/settle etc then it would be stupid to design such a thing.
Does this also mean that if the engine holds five litres that when you do an oil change you have to put 4.5 litres in a jug and warm it up first to get 5 litres?????????
Just out of interest, my old coupe used selenia 20k semi-synth and the readings hot and cold were always identical - i only see a very slight difference now with fully-synth between the readings.
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Re: cold reading dipstick
#189161
11/09/2006 14:52
11/09/2006 14:52
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Anonymous
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Anonymous
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Quote:
I've always wondered this as well - everyone seems to say that you check when its warm but the handbook doesn't say that - just to wait 10 mins after stopping to let it settle.
Surely when you are dipping something into a liquid to test its depth the most accurate way is to wait until its completely cooled and settled - to actually design a gauge that works when the oil is warm and have it be acurate would be a nightmare.
When you take into consideration the different types, thickness, and makes of oil that are used and that fact that different oils take different times to cool/settle etc then it would be stupid to design such a thing.
Does this also mean that if the engine holds five litres that when you do an oil change you have to put 4.5 litres in a jug and warm it up first to get 5 litres?????????
Just out of interest, my old coupe used selenia 20k semi-synth and the readings hot and cold were always identical - i only see a very slight difference now with fully-synth between the readings.
I totally agree with all of that mate - surely the 10-minutes-stipulation is so people don't check it straight after they switch off, i.e give it time to settle ?
And I also agree that checking when cold is the most accurate - as I've probably said on here before, what's the oil going to do after 10 minutes - start climbing out of the sump again ?
But, having said all of that, it says 10 minutes in the book and I always try and do EXACTLY what I'm told. Then, if it goes wrong, you know you can't blamed for following instructions
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Re: cold reading dipstick
#189163
11/09/2006 15:12
11/09/2006 15:12
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Joined: Dec 2005
Posts: 21,071 Chertsey in the Thames
bockers
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Hon Club Member 007
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Joined: Dec 2005
Posts: 21,071
Chertsey in the Thames
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The reason for the warm reading specification is that this is the most controllable situation to get the car into. This procedure is mainly for the benefit of the Servicing garages. By letting then engine reach operating temperature and then waiting 10 mins the garage can check oil at any time and after a road test. If it were to be a cold reading they would have to wait a considerable time to check the oil, adding to service times and generally causing inconsisten readings due to what is considered “cold”. As an owner it is a bit of a pain, but when going round to check on potential cars to buy it make the procedure easier as you can check the oil after a test drive and also after leaving the car to idle to check for turbo oil seal failure. There is some method in the madness Of course you can add your own cold reading marks to the dipstick.
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Re: cold reading dipstick
#189164
11/09/2006 17:26
11/09/2006 17:26
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Anonymous
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Anonymous
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With Motul 300V oil I have no idea how much is in the car with a warm reading - just can't see it on the dipstick. So cold reading it is for me!
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Re: cold reading dipstick
#189165
11/09/2006 17:41
11/09/2006 17:41
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Anonymous
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Anonymous
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Quote:
This procedure is mainly for the benefit of the Servicing garages
I'd seriously doubt that.
a hot-check is more representative of the oil level available to the oil-pump , having discounted the oil which is still , slowly , making its way back to the sump.
and even with a baffled sump that the coupe has, oil surge is a real danger , esp , on track. All you need is for the oil pickup to grab a moment of air and your engine is dead.
I track alot , and I religiously do a very hot check just before the out-lap.
I think that the hot-check is a middle-ground between the wet sump and the dry sump systems. Ie , its insurance.
cheers. .
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Re: cold reading dipstick
#189166
11/09/2006 19:11
11/09/2006 19:11
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Anonymous
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Anonymous
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i have it from paul at motormech that to check cold is the only reliable way of knowing for sure how much (or little!) oil is in the car. that'll do for me...
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Re: cold reading dipstick
#189167
11/09/2006 21:16
11/09/2006 21:16
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Anonymous
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Anonymous
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no offense , maybe its just me , but I'd rather read the manual.
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Re: cold reading dipstick
#189168
12/09/2006 00:21
12/09/2006 00:21
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Joined: Jan 2006
Posts: 1,618 Oswestry
Genic
OP
My life on the forum
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OP
My life on the forum
Joined: Jan 2006
Posts: 1,618
Oswestry
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Quote:
Of course you can add your own cold reading marks to the dipstick.
that might not be a bad idea think when i do another oil change and i know that there is the correct amount of oil in, i will make a mark on the dip stick. sab=ves having to start the car up every time i need to check the oil
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Re: cold reading dipstick
#189169
12/09/2006 06:48
12/09/2006 06:48
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Joined: Jan 2006
Posts: 996 Mitcham/Croydon
Coupe_Don
Enjoying the ride
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Enjoying the ride
Joined: Jan 2006
Posts: 996
Mitcham/Croydon
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Quote:
i have it from paul at motormech that to check cold is the only reliable way of knowing for sure how much (or little!) oil is in the car. that'll do for me...
Hi,
this debate will never go away but I always find it interesting There is even a difference of opinion between well respected mechanics on here as to whether the oil should be measured from cold or hot and the person I trust to do work on my car says to measure the oil from cold on level ground as thats how it goes in...........so I measure it when hot 10mins after switching the engine off!
The way I look at it is the people who designed the engine and tested it must know a fair bit about it dont you think? Maybe as mentioned by Pisole it is a safety thing and in the past when I have checked the oil from cold its way above the hot reading but im sure this would have all been taken into account. I offcourse could be wrong as is usually the case so i'll shut up now!
Cheers John
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Re: cold reading dipstick
#189170
12/09/2006 10:26
12/09/2006 10:26
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Anonymous
Unregistered
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Anonymous
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I have just written to Fiat to ask for an explanation.
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Re: cold reading dipstick
#189172
12/09/2006 16:08
12/09/2006 16:08
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Anonymous
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Anonymous
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LOL - they'll quote the manual!
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Re: cold reading dipstick
#189173
12/09/2006 19:56
12/09/2006 19:56
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Joined: Jan 2006
Posts: 996 Mitcham/Croydon
Coupe_Don
Enjoying the ride
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Enjoying the ride
Joined: Jan 2006
Posts: 996
Mitcham/Croydon
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Quote:
I have just written to Fiat to ask for an explanation.
Quote:
LOL - they'll quote the manual!
I doubt who ever reads the letter will know or care anymore tbh and this is the same reason why you don't get the service you expect for our cars from alot of fiat dealers! Although it would be interesting to see what they say, you never know somebody might take it upon themselves to give an informative explanation.
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Re: cold reading dipstick
#189174
12/09/2006 20:05
12/09/2006 20:05
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Anonymous
Unregistered
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Anonymous
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yeah i see where you're coming from for the more technically gifted than me (anyone, really ) if the sump holds,say,5 litres and you check it cold and it returns a reading up to the top of the hatched area, does this mean it has the 5 litres in it? if so, surely thats the only truly accurate measure? i give up, i'm so confused!!!
Last edited by proccy; 12/09/2006 20:13.
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