First oil change... Lubro Moly 5W40
07-03-2010, 03:05 PM
#17
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07-03-2010, 03:08 PM
#18
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The one oil presumably contains molybdenum disulfide. It is a good lubtricant but I would not want that ( such particles floating ) in my engine. I am not sure what the effect will be.
The term synthetic is a loosly use term in lubricants.
Some are blends of synthetic and mineral oil. Some are "gas to oil" which use natrual gas to produce a "synthetic" oil. Mobil 1 is a polyalphaolefin. It is a an oligomer ( short chain ) of alpha olefins. It also contains a small amount of polyol ester to swell oils seals slightly. In addition, all of these oils use typical dispersant/inhibitor packages to protect the oil and protect your engine. Finally, to achieve the wide temperature range for oils ("multi vicosity") they use viscosity index improvers. To achieve a 5W-40 the formulator will use polymers ( typically ethylene-propylene elastomers) to keep the viscosity of lower viscosity lubricants from falling too much as the temperature increases. These polymers are fully dissolved in the oil. With less VI improver, a 15W-40 would theortically be more shear stable than a 5W-40 oil.
The term synthetic is a loosly use term in lubricants.
Some are blends of synthetic and mineral oil. Some are "gas to oil" which use natrual gas to produce a "synthetic" oil. Mobil 1 is a polyalphaolefin. It is a an oligomer ( short chain ) of alpha olefins. It also contains a small amount of polyol ester to swell oils seals slightly. In addition, all of these oils use typical dispersant/inhibitor packages to protect the oil and protect your engine. Finally, to achieve the wide temperature range for oils ("multi vicosity") they use viscosity index improvers. To achieve a 5W-40 the formulator will use polymers ( typically ethylene-propylene elastomers) to keep the viscosity of lower viscosity lubricants from falling too much as the temperature increases. These polymers are fully dissolved in the oil. With less VI improver, a 15W-40 would theortically be more shear stable than a 5W-40 oil.
Mobil-1 0W40
Density at 15º C: 0.85
Viscosity at 40º C: 78.3
Viscosity at 100°C: 14
Pour point: ?
Motul 5W40
Density at 15°C: 0.854
Viscosity at 40°C: 83.1 mm²/s
Viscosity at 100°C: 14.0 mm²/s
Pour point: -39 °C
Lubro Moly 5W40
Density at 15º C: 0.85
Viscosity at 40º C: 86
Viscosity at 100°C: 14.4
Pour point: -45 °C
Lubro Moly 10W60 (ref)
Density at 15º C: 0.86
Viscosity at 40º C: 163
Viscosity at 100°C: 23
Pour point: -35 °C
Mobil-1 doesn't state their pour point, the only difference between 0W and 5W is for cold cranking (-30 vs. -25)... but at 15°C (cold start for most), they are identical as you see above, and the other oils are closer to the race oil (the 10W60) and basically better for high temp IMO.
At the end of the day, the difference between all of these great oils are very small, as long as one change their oil frequently enough, and I just saw absolutely NO reason to pay double for Mobil-1 (I know the price difference in US is not as much).
Last edited by alexb76; 07-03-2010 at 03:47 PM.
07-03-2010, 04:25 PM
#19
Race Director
07-03-2010, 05:11 PM
#20
Race Director
Castrol Syntec 5w50 is what I am using right now.
07-03-2010, 05:55 PM
#21
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I never said exhaust sounded different. Valvetrain/engine, it's very hard to describe, it sound like it's running smoother, or there's less "metal" sound, and a little quieter. It's very subtle but definitely different.
07-03-2010, 05:56 PM
#22
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07-03-2010, 06:08 PM
#23
Maybe, but as the article posted showed, the 0W-40 SM rating has LESS additives (less zinc), to comply with SM- rating, which is NOT an advantage.
May not be that much of a difference, let's compare cold numbers vs. Motul 8100.
Mobil-1 0W40
Density at 15º C: 0.85
Viscosity at 40º C: 78.3
Viscosity at 100°C: 14
Pour point: ?
Motul 5W40
Density at 15°C: 0.854
Viscosity at 40°C: 83.1 mm²/s
Viscosity at 100°C: 14.0 mm²/s
Pour point: -39 °C
Lubro Moly 5W40
Density at 15º C: 0.85
Viscosity at 40º C: 86
Viscosity at 100°C: 14.4
Pour point: -45 °C
Lubro Moly 10W60 (ref)
Density at 15º C: 0.86
Viscosity at 40º C: 163
Viscosity at 100°C: 23
Pour point: -35 °C
Mobil-1 doesn't state their pour point, the only difference between 0W and 5W is for cold cranking (-30 vs. -25)... but at 15°C (cold start for most), they are identical as you see above, and the other oils are closer to the race oil (the 10W60) and basically better for high temp IMO.
At the end of the day, the difference between all of these great oils are very small, as long as one change their oil frequently enough, and I just saw absolutely NO reason to pay double for Mobil-1 (I know the price difference in US is not as much).
May not be that much of a difference, let's compare cold numbers vs. Motul 8100.
Mobil-1 0W40
Density at 15º C: 0.85
Viscosity at 40º C: 78.3
Viscosity at 100°C: 14
Pour point: ?
Motul 5W40
Density at 15°C: 0.854
Viscosity at 40°C: 83.1 mm²/s
Viscosity at 100°C: 14.0 mm²/s
Pour point: -39 °C
Lubro Moly 5W40
Density at 15º C: 0.85
Viscosity at 40º C: 86
Viscosity at 100°C: 14.4
Pour point: -45 °C
Lubro Moly 10W60 (ref)
Density at 15º C: 0.86
Viscosity at 40º C: 163
Viscosity at 100°C: 23
Pour point: -35 °C
Mobil-1 doesn't state their pour point, the only difference between 0W and 5W is for cold cranking (-30 vs. -25)... but at 15°C (cold start for most), they are identical as you see above, and the other oils are closer to the race oil (the 10W60) and basically better for high temp IMO.
At the end of the day, the difference between all of these great oils are very small, as long as one change their oil frequently enough, and I just saw absolutely NO reason to pay double for Mobil-1 (I know the price difference in US is not as much).
The viscosity for the Lubro Moly 10W-60 is very high at 40C. Again I would be intersted to know what the viscosity is for that lube at 0C or even 15C compared to the others. My guess is that it might be high. Again, startup is when tthe most wear occurs.
I am sure that the pour points for all of these oils is low as there is no wax as with mineral oils.
07-03-2010, 06:16 PM
#24
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07-03-2010, 07:03 PM
#25
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You are indicating that the density is the same for these oils at 15C. This is irrelevant. The viscosity at 15C might be interesting. The "W" rating ( 0W, 5W, 10W, etc.) is at 32F or 0C. My guess is that this where you might see a difference.
The viscosity for the Lubro Moly 10W-60 is very high at 40C. Again I would be intersted to know what the viscosity is for that lube at 0C or even 15C compared to the others. My guess is that it might be high. Again, startup is when tthe most wear occurs.
I am sure that the pour points for all of these oils is low as there is no wax as with mineral oils.
The viscosity for the Lubro Moly 10W-60 is very high at 40C. Again I would be intersted to know what the viscosity is for that lube at 0C or even 15C compared to the others. My guess is that it might be high. Again, startup is when tthe most wear occurs.
I am sure that the pour points for all of these oils is low as there is no wax as with mineral oils.
Yeah, 10W60 is pretty high, it's a racing oil that can be used on the street, it's assumed your oil doesn't stay at 40 degrees much in those coniditions!
I didn't use it. Just referenced it here to show that Mobil-1 0W40 is thinner than the 5W40s, and those are a bit closer to racing oil (better for high performance, trackings), than 0W40.
07-03-2010, 08:52 PM
#26
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I just had my oil changed for the second time today. FWIW, my mechanic insists on Pentosin (a German brand) 5W-40 and I'm changing it every 5k miles. Someone's going to shout out I'm wasting my money changing it that often but thpfffffftt we all spent $80k+ on a car, and an oil change is a waste of money?
07-03-2010, 09:29 PM
#27
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I'll stick my neck out here: mine does the same after an oil change. The engine runs just a bit smoother, and there is a bit less mechanical (valvetrain) noise, although the exhaust and that whining sound are just the same. Either you're not crazy or we share this delusion.
Well, I have never heard any difference in engine sound after an oil change in any of my previous cars... so, either my oil was factory break-in oil (when I bought the car had only 5K miles), or maybe something totally different that had totally different characteristics than the new oil?!
Not sure, as I wasn't told when was the last time oil change happened (if at all), and what kind of oil.
07-03-2010, 10:19 PM
#28
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I just had my oil changed for the second time today. FWIW, my mechanic insists on Pentosin (a German brand) 5W-40 and I'm changing it every 5k miles. Someone's going to shout out I'm wasting my money changing it that often but thpfffffftt we all spent $80k+ on a car, and an oil change is a waste of money?
07-03-2010, 10:23 PM
#29
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http://www.youtube.com/watch?v=IHXioXSEMWM
When I saw this as a young lad I didn't have a car but I knew when I finally got something nice, THIS is what I was going to run in her!
When I saw this as a young lad I didn't have a car but I knew when I finally got something nice, THIS is what I was going to run in her!
