10w-40, What does it mean??

[Keith]

What about 5w50 Mobil in Performance S2 application?

Typical Properties

Mobil 1 5W-50
Value
Viscosity, ASTM D 445
cSt @ 40º C 104.6
cSt @ 100º C 17.4
Sulfated Ash, wt%, ASTM D 874 1.3
Phosphorous 0.1
Flash Point, ºC, ASTM D 92 228
Density @15º C kg/l, ASTM D 4052 0.86
Total Base Number (TBN) 11.8
MRV at -35ºC 27653
Viscosity Index 184
HTHS Viscosity, mPa•s @ 150ºC, ASTM D 4683 4.3

Nice VI... Not bad I think.. but i'd prefer a little higher viscosity @ 100°C like this :

here is :

Castrol TWS Motorsport :

SAE 10W-60
__________________________________________________ ______________________________



Test Methode(s) Unité Type
Densité à 15°C, Relative ASTM D4052 0.864
Apparence Visuel Clair Limpide
Viscosité cinématique 100°C ASTM D445 mm²/s 24.4
Viscosité cinématique 40°C ASTM D445 mm²/s 161
Indice de viscosité ASTM D2270 179
Viscosité, CCS -25C (10W) ASTM D5293,DIN 51377 cP 4860
Point d'éclair, PMCC ASTM D93 °C 200
Cendres sulfatées ASTM D874 % m 1.1
Total Base Number, TBN ASTM D2896 mg KOH/g 8.1
Point d'écoulement ASTM D97 °C -51

[oilman]

Why use 10w-60? The viscosity is too high when hot, not even the oil pump is designed for that viscosity.

Cheers

Guy.

[oilman]

An ester pao 5w-40 or 10w-50 would be about right.

14 to 18cst at 100degC (that's sae 40 or 50) is more than adequate in a car where 11cs is the OEM recommendation for standard road cars

Cheers

[Keith]

not even the oil pump is designed for that viscosity.

Cheers

Guy.

are you kidding ????

if it can't pump 17 cSt @ 100°C how would it pump @ -10°C ????

[oilman]

What about cavitation at high revs?

[Keith]

What about cavitation at high revs?

there are insignificant behavior changes between 15 Cst or 25 @ 100°C !

but the lubricating film resistance will be higher @ 25cSt than @15 !

I have used low viscosities in my S2 (an others) and when getting above 100 °C up to 120°C the viscosity is too low to ensure the good function of hydraulic push rods !

[oilman]

I agree but an sae 50 at 120degC is roughly equivalent to an sae 40 at 100degC.

120 degC is pretty high temp-wise for all but a proper fully synthetic.

Surely at this temp an uprated oil cooler would be a better solution and sticking with something like a decent 5w-40 synthetic, a proper one?

Cheers

[Keith]

I agree but an sae 50 at 120degC is roughly equivalent to an sae 40 at 100degC.

120 degC is pretty high temp-wise for all but a proper fully synthetic.

Surely at this temp an uprated oil cooler would be a better solution and sticking with something like a decent 5w-40 synthetic, a proper one?

Cheers

I have bought 12 liters of Mobil 1 5w-50.

here :

Mobil 1 5W-50 meets or exceeds the following industry specifications:
5W-50
API SM/SL/SJ/CF X
ACEA A3/B3 X
A3/B4 X


Mobil 1 5W-50 has the following builder approvals:
5W-50
VW 505 00 X
PORSCHE Special Oil List X
MB-Approval 229.3 X
MB-Approval 229.1 X


Typical Properties

Mobil 1 5W-50
Value
Viscosity, ASTM D 445
cSt @ 40º C 104.6
cSt @ 100º C 17.4
Sulfated Ash, wt%, ASTM D 874 1.3
Phosphorous 0.1
Flash Point, ºC, ASTM D 92 228
Density @15º C kg/l, ASTM D 4052 0.86
Total Base Number (TBN) 11.8
MRV at -35ºC 27653
Viscosity Index 184
HTHS Viscosity, mPa•s @ 150ºC, ASTM D 4683 4.3

I'm going to try it !!!!
the problem is that you never know how much pao an ester it contains....
to have an objective opinion we would need to know whitch additives are used and how much..... but we'll never know that !!!!

[Keith]

Surely at this temp an uprated oil cooler would be a better solution
Cheers

I'm thinking about it.... I have to figure out how much free space I have !!!

[oilman]

Try this one next time, it has good ester content

http://www.opieoils.co.uk/p-1145-silkolene-pro-s-10w-50-ester-synthetic-oil-for-high-performance-engines.aspx

Cheers

[philS2]

i've just bought four 20 litres of mobil one 15/50 motorsport and was begining to think i'd made a mistake,then as i read on i thought i was ok,then not ok,then ok. either way it's going in.

[Keith]

Try this one next time, it has good ester content

http://www.opieoils.co.uk/p-1145-silkolene-pro-s-10w-50-ester-synthetic-oil-for-high-performance-engines.aspx

Cheers

you work for Fuchs or what ????

[Keith]

Try this one next time, it has good ester content

http://www.opieoils.co.uk/p-1145-silkolene-pro-s-10w-50-ester-synthetic-oil-for-high-performance-engines.aspx

Cheers

any tech. data ????

[oilman]

Yes, pm me your e-mail addy and I will forward it on.

Cheers

[oilman]

you work for Fuchs or what ????

Nope