Oil grade manuf. - eg. Syntec grades???

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May 28, 2002
How are different oil grades achieved? Is each one "engineered" differently or does the oil company simply thin or thicken things as required with addatives?

For eg., I just put in the Belgian Syntec 5-40 last week and it basically seems like a slightly thinner version of the 5-50. They smell exactly alike too. Are these 2 oils basically the same basestock & addative package and Castrol simply thins one out over the other or is something else going on? Are the other grades of Syntec achieved the same way (other than GC of course)?
In most cases the oil blenders will use the exact same additive packages in the different oil grades (not counting viscosity index improvers). Most of the Syntec grades probably use the same additive package with a different viscosity base oil or a blend of base oils.

Castrol GTX will have a very different additive package as will their other oils such as Castrol High Mileage oil, etc.

When I saw the data sheet on this oil change along with the label I thought I would send this in to see what it's about . I like the relatively low Vi at 100c . The stuff smells like sweet detergent . I think this would make a great choice in oil for many cars especially in the summer months . It's a ACEA A3-B3 and ISLAC GF-3 oil which I like and has other ratings as well .

Iron 0
Aluminum 2
Sodium 3

Moly 61
Boron 66
Magnesium 13
Calcium 3451
Phos 1004
Zinc 1133
Silicone 12
Vi 40c 85.4
Vi 100c 13.1
VI Index 154
TAN 1.90
TBN 10.98


Here is a VOA of Castrol Syntec 5W-50 from another forum. The date this sample was received by the lab is November 14, 2002.

Castrol Syntec 5W-50Vis.
SUS @ 212 F 88.9
TBN 10.7
Insolubles Nil
Water Nil
Dilution Nil
Iron 0.9
Silver 0.0
Aluminum 1.7
Chromium 0.2
Copper 0.2
Magnesium 14.5
Sodium 2.1
Nickel 0.0
Lead 0.1
Silicon 0.7
Tin 0.0
Titanium 0.0
Boron 96
Barium 0.0
Molybdenum 59
Vanadium 0.0
Zinc 1160
Manganese 0.9
Calcium 2967
Phosphorous 1063

The two above VOA's look fairly similar except for the different viscosities. The ppm amounts for the additives seem to be within the margin of error for the oil analysis companies.


Man alive , I like this oil and look at that magnesium and Vi Index

It's the SL/CF ACEA A3/B3/B4-98 502-505 Oil

Iron 4
Aluminum 2

Magnesium 1118
Calcium 1287
Phosphorus 939
Zinc 1175
Sodium 13
Silicone 2

Vi 40c 81
Vi 100c 14.3
Vi Index 184
TAN 2.02
TBN 9.07

Comments about this 5 buck a quart oil imported from Belgium ?

Post from TooSlick:

In the interest of science, I bought a qt of this magic elixer for $12.50, plus tax. I'm underwhelmed to say the least - kind of like expecting a date with Brooke Shields and getting Albert Brooks in a dress instead ...

Viscosity @ 100C, 13.7 Cst

Fe, 1 ppm - rusty pipes

Detergent/Dispersant Additives:

Mg, 8 ppm
Ca, 2361 ppm

Anti Wear/Oxidation Inhibitors

P, 1045 ppm
Zn, 1270 ppm

Si, 1 ppm - antifoam additive

Friction Modifiers:

Boron, 0 ppm
Moly, 0 ppm

TBN/ASTM D-4739, 12.15


Castrol makes two 5W-40 motor oils and they each use a different additive package.

[ May 25, 2004, 10:12 PM: Message edited by: Sin City ]
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