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viiking
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Joined: May 10, 2013
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Location: Sydney Australia
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 Posted: Tue Jun 06, 2023 4:07 pm Post subject: Re: 20w-60 multigrade oil question |
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The terms 20W and 60 refer to a reference viscosity at a certain temperature.
The viscosity curves of different manufacturer's oils can be completely different as long as at the reference temperature they comply. For example the 60 defines the viscosity of an oil at (usually) 100 degrees C.
As each company uses different friction modifiers and viscosity modifiers it is not really accurate to say that one oil is "thicker" than others. It may only be at the reference temperatures.
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1968 1500 RHD Lotus White Beetle since birth. In the hospital for major surgery
1966 Lancia Flavia Pininfarina Coupe - in the waiting room
Discharged: 1983 Vanagon, 1974 1800 Microbus,1968 Low Light,1968 Type 3 |
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Glenn 
Mr. 010
Joined: December 25, 2001
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| Posted: Tue Jun 06, 2023 4:21 pm Post subject: Re: 20w-60 multigrade oil question |
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So are we talking synthetic or mineral oil?
Because that matters.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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zerotofifty
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Joined: December 27, 2003
Posts: 1566
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| Posted: Tue Jun 06, 2023 9:48 pm Post subject: Re: 20w-60 multigrade oil question |
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| Ovally wrote: |
| bnam wrote: |
| tcoop1100 wrote: |
"Temperature and clearance, but also speed." Operating environment plays a big role too, right? A consistently warm-to-hot climate you might want a good higher weight oil, for film strength and longevity at a higher temperature. A cooler environment, where the engine maybe isnʻt as vulnerable to heat issues, can use a lighter oil. |
Probably why VW of Australia recommended 20w-60 |
In Western Europe 20W50 for engines with mechanical lifters and 15W40 for engines with hydraulic lifters.
Regards. |
western europe, would that be in northern Norway, or Southern Spain?
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chookhen
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Joined: January 21, 2021
Posts: 42
Location: Queensland Australia
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| Posted: Tue Jun 06, 2023 11:04 pm Post subject: Re: 20w-60 multigrade oil question |
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| Mineral Oil. |
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Maddel
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Joined: February 12, 2013
Posts: 935
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| Posted: Wed Jun 07, 2023 1:39 am Post subject: Re: 20w-60 multigrade oil question |
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Just for fun... 
1972 Owners Manual...
1975 Owners Manual...
Now have some fun! 
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| Let him who hath understanding reckon the number of the beast... |
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Ovally
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Joined: June 14, 2014
Posts: 476
Location: Belgium
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| Posted: Wed Jun 07, 2023 1:47 am Post subject: Re: 20w-60 multigrade oil question |
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| zerotofifty wrote: |
western europe, would that be in northern Norway, or Southern Spain? |
The Netherlands, Belgium, Luxembourg, France, UK, Ireland.
Regards.
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Porsche 911S MFI 1970
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Ovally
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Joined: June 14, 2014
Posts: 476
Location: Belgium
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| Posted: Wed Jun 07, 2023 12:30 pm Post subject: Re: 20w-60 multigrade oil question |
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| Franklinstower wrote: |
| that is a very interesting read. Tech Article 69 is about Aircooled Engines, FYI. Ironically, I run the preferred A/C oil in my 911 - 20/50 VR1 Racing oil. |
I run 20W50 in my 911S MFI 1970.
This is what Porsche says :
20W-50 Porsche Classic Motor/Mineral Oil is specially adapted to the early air-cooled models for all 356, 912, 914 and 911 models with a displacement of up to 2.7 liters.
For all 356, 912, 914 and 911 models up to the 2.7-liter G-Model, Porsche recommends the multi-grade version with a viscosity of 20W-50. Back in the 1950s, 1960s and 1970s, engines were built with much more generous tolerances than today, which is why the viscosity of an oil must be low enough for it to penetrate into all areas of the engine as quickly and uniformly as possible during cold starts. At the same time, however, its viscosity must not be so low that a stable lubricating film is no longer present when the engine heats up. The developers went to particular lengths to achieve excellent cold start properties for the oil, so that the engine can be lubricated as quickly as possible when started. The CCS test was especially important in this respect, since it simulates the behavior of the oil in the crankshaft bearing during cold starts and at low temperatures.
The Porsche Classic 20W-50 is a mineral oil known as a hydrocracked base oil with mildly alloyed additives. Hydrocracked base oils are characterized by a very low level of contaminants, a very low sulphur content and very good oxidation and aging stability, which prevents deposits, for example. At the same time, the Porsche Classic Motor Oil 20W-50 has an extremely high HTHS viscosity (High Temperature, High Shear), which describes the quality of the engine oil at high temperatures (150 °C) in the lubricating gap and with high shear rate (engine speeds). Finally, the excellent shear stability ensures that the optimum lubricating properties are reliably retained at high engine temperatures, even after long periods of operation and under high loads.
In a nutshell: low levels of deposits (at both hot and cold temperatures), optimum care for classic engines and excellent compatibility with the special materials found in these engines such as cork seals or leaded bearing shells.
Regards.
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VW Bug Oval 1953
VW Bug 1200 D motor
Porsche 911S MFI 1970
Mazda 929 Hardtop 1977
Mercedes SLC 180 Roadster 2018 |
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viiking
Samba Member
Joined: May 10, 2013
Posts: 2668
Location: Sydney Australia
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| Posted: Wed Jun 07, 2023 4:49 pm Post subject: Re: 20w-60 multigrade oil question |
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| Maddel wrote: |
Just for fun...
1972 Owners Manual...
1975 Owners Manual...
Now have some fun!
| Quote: |
| Let him who hath understanding reckon the number of the beast... |
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And in the Australian Antarctic Beetle they used oil so thin that it had the viscosity of kerosene because the previous 10W30 was too thick.
_________________
1968 1500 RHD Lotus White Beetle since birth. In the hospital for major surgery
1966 Lancia Flavia Pininfarina Coupe - in the waiting room
Discharged: 1983 Vanagon, 1974 1800 Microbus,1968 Low Light,1968 Type 3 |
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Glenn
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