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 Engine Oil Color, engine oil color |
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 Sep 3 2008, 05:56 AM
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Newbie
Group: Members
Posts: 7
Joined: 6-April 08
Member No.: 43,617
Status: 
Location: Australia
Drives: 2007 Hyundai Accent SLX hatch
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i've got the 2007 hatch. i do a lot of short trips and i've had the oil in for 6 months now only done abour 2000 miles since the last 6 month ol change and its been winter here. the oil is a lightish brown color. is that anything to be concerned about given its a near new car or just normal dirt particles picked up my the oil. its magnatech 15w - 40 i think
i'm gonna change the oil this weekend
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Sep 3 2008, 11:18 PM
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Member
Group: Members
Posts: 34
Joined: 20-August 08
Member No.: 50,118
Status:
Location: USA
Drives: 2008 Hyundia Accent SE
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QUOTE(mrblank @ Sep 3 2008, 09:57 PM) I am lost is lighter oil good for performance doesnt Oil heat up become lighter? why would you need heavy oil Why the colour honey why cant it be Blue or Green
[right][snapback]187740[/snapback][/right]
i know on my street bike i use 10W/40 it's pretty light oil, some use 20W/50 but that's not good when it's cold out. doesn't circulate as well i believe. i'm no oil expert. where i live it's Hot in the summer 90's-100 +++ , and cold in the winter often under 30 degree's. so the 10/40 wins. blue or green oil???? i haven't a clue.
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Sep 4 2008, 12:04 AM
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Senior
Group: Members
Posts: 471
Joined: 22-January 08
Member No.: 40,185
Status:
Location: Alabama , USA
Drives: 2007 Hyundai Accent GS
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QUOTE(mrblank @ Sep 4 2008, 12:57 PM) I am lost is lighter oil good for performance doesnt Oil heat up become lighter? why would you need heavy oil Why the colour honey why cant it be Blue or Green
[right][snapback]187740[/snapback][/right]
Lighter oil is thinner and has less resistance,so there is less drag inside the engine making cold starts easier.Heavier oil will not leak around rings or gaskets as easily (important in cars with loads of miles.) Why honey colored That's the natural colo of refined oil.If it were blue or green it would have dyes in it and most dyes are acidic in nature. The darker the oil becomes I.E. brown,black,the more it has broken down or been contaminated. :57:
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Sep 4 2008, 01:09 AM
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Full Member
Group: Members
Posts: 114
Joined: 21-July 08
Member No.: 48,677
Status:
Location: Canada
Drives: 92 Mustang GT 408w, 08 Accent
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15-40 for that motor is way to heavy. You can't do that anymore, change oil viscosity's. Vehicles now'a'days are machined so precisely, using a heavy oil like that could run bearings dry, among other things. Oil passages now are also a lot smaller than they used to be, hence if you read your manual, it calls for 5w20 or 5w30 in below zero weather or 10w30 above that. Generally it's OK to go down in viscosity, such as 0w30, especially in climates such as my own where -40 weather isn't uncommon, but you definately don't want to go up
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Sep 4 2008, 01:20 AM
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Full Member
Group: Members
Posts: 114
Joined: 21-July 08
Member No.: 48,677
Status:
Location: Canada
Drives: 92 Mustang GT 408w, 08 Accent
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QUOTE(mrblank @ Sep 3 2008, 10:57 PM) I am lost is lighter oil good for performance doesnt Oil heat up become lighter? why would you need heavy oil Why the colour honey why cant it be Blue or Green
[right][snapback]187740[/snapback][/right]
As the engine gets hotter come hotter climates, the viscosity of the oil gets much thinner, cold starting the motor with a thicker oil in summer won't cause dry starts, where-as if you try to start a vehicle with 15-40 in the -40 weather we have here, it wouldn't have oil pressure for probably 10-15 seconds after starting it, even when you get it, it's very poor as it won't pass through the bearings properly as it's too thick. Once the engine is warm though, thicker oils lubricate better. Thinner viscosity oils have a tendancy to reveal small imperfections in an engine, as they are thinner, there is not as much of an "oil barrier" if you may between bearings, pistons, cam... etc. As in a perfect world, there is no metal to metal contact in a motor, your crankshaft floats in the bearings, never actually touching them, if it did, it would wear them out in a hurry, same with pistons, they should never touch the cylinder walls in a perfect world as there should be enough oil between them, as well as the rings. The thicker oils will leave more oil for these components to ride on, where as thinner ones will get "squeezed out" of the bearings more easily, if you understand that. In summer I run 10w30 in all my cars, winter, 5w30
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Sep 4 2008, 10:15 PM
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Full Member
Group: Members
Posts: 192
Joined: 12-July 08
Member No.: 48,311
Status:
Location: usa
Drives: 08 accent
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QUOTE(liquid_02 @ Sep 4 2008, 01:20 AM) As the engine gets hotter come hotter climates, the viscosity of the oil gets much thinner, cold starting the motor with a thicker oil in summer won't cause dry starts, where-as if you try to start a vehicle with 15-40 in the -40 weather we have here, it wouldn't have oil pressure for probably 10-15 seconds after starting it, even when you get it, it's very poor as it won't pass through the bearings properly as it's too thick. Once the engine is warm though, thicker oils lubricate better.
Thinner viscosity oils have a tendancy to reveal small imperfections in an engine, as they are thinner, there is not as much of an "oil barrier" if you may between bearings, pistons, cam... etc. As in a perfect world, there is no metal to metal contact in a motor, your crankshaft floats in the bearings, never actually touching them, if it did, it would wear them out in a hurry, same with pistons, they should never touch the cylinder walls in a perfect world as there should be enough oil between them, as well as the rings. The thicker oils will leave more oil for these components to ride on, where as thinner ones will get "squeezed out" of the bearings more easily, if you understand that.
In summer I run 10w30 in all my cars, winter, 5w30
[right][snapback]187769[/snapback][/right]
this is spot on! Heavy oils in modern cars is not usually recomended. If your motor is stock, use what is recommended by the manufacturer. I am currently running 10w30 year round, fully synthetic. Dino oil tends to suffer viscosity break down alot faster than synthetic, hense the extra miles between changes with synthetic. edit: lighter weight oil will give better gas mileage, while heavier weight oils add better engine protection against wear. have to find a happy balance.
This post has been edited by fonque: Sep 4 2008, 10:16 PM
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Sep 5 2008, 05:33 AM
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Newbie
Group: Members
Posts: 7
Joined: 6-April 08
Member No.: 43,617
Status:
Location: Australia
Drives: 2007 Hyundai Accent SLX hatch
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i went to the dealer today for my service and they put in castrol magnatec 10 W -30. is this a reasonable oil for Australian conditions where i live the temperature is from 0 through to 40 , now winter is over 5 and over more or less. Will 30 be ok during the warmer weather of 30 degrees celcius and more?
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