Mobil1 vs Castrol RS

[Motorbike]

quote:

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Originally posted by hungdynasty:


Looks to me the Castrol RS is better, isn't it?

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Hows that ? What ACEA and other specs does each oil meet ?

 

[Losiho]

quote:

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Originally posted by Motorbike:
Hows that ? What ACEA and other specs does each oil meet ?

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I have both oils in my collection. Both are A3, B3, B4, BMW LL, VW 502, 505 and 503.01, and MB 229.3. M1 0w40 is 229.5 approved, Castrol is not, nor does it have GM / Opel LL certification.

Which is "better" ? I think they're pretty much the same, the Castrol is a little thinner. But I don't think there has been a UOA of Formula R / RS 0w40 here, so I not sure it would shear to a 30w like M1 does.

 

[buster]

Looks like a toss up to me. You'd have to run both and do a UOA to see which chemistry is providing better wear.

 

[hungdynasty]

Here's the spec. of these two oils

Mobil 1 0W-40
SAE Grade 0W-40
Viscosity, ASTM D 445
cSt @ 40º C 80
cSt @ 100º C 14.3
Viscosity Index, ASTM D 2270 187
Sulfated Ash, wt%, ASTM D 874 1.2
HTHS Viscosity, mPa·s @ 150º C, ASTM D 4683 3.6
Pour Point, ºC, ASTM D 97 -54
Flash Point, ºC, ASTM D 92 236
Density @15º C kg/l, ASTM D 4052 0.855


Castrol RS 0W40
SAE 0W-40
Relative Density at
15ºC
ISO 3675 / ASTM D1298 g/cm3 0.84
Viscosity at 40ºC ISO 3104 / ASTM D445 mm2/s 73.5
Viscosity at 100ºC ISO 3104 / ASTM D445 mm2/s 12.9
Viscosity Index ISO 2909 / ASTM D2270 - 177
CCS -35ºC ASTM D5293 mPa.s 5200
Total Base Number ASTM D2896 mgKOH/g 10.3
Flash Point (COC) ISO 2592 / ASTM D92 0C 238
Pour Point ISO 3016 / ASTM D97 0C -57
HTHS CEC L-36-A-90 cP 3.7

Looks to me the Castrol RS is better, isn't it?

WHOEVER WINS... OUR WALLETS LOSE.

 

[Hirev]

Don't know what one is the best but I find it interesting that Mobil 1 0w 40 is now the factory fill on all Porsche's with recommend 20,000 mile OCI. Also factory fill on some Mercedes Benz.

I Just picked 6 qts Mobil 0w 40 on a coupon special at $3.97 a quart. Going to try it for Winter oil next oil change and run it for 8500 miles in my Toyota.

The reason I wanted to try Mobil for the long OCI over Castrol is that Mobil 1 is a Group 4 base oil. The Castrol 0w - 40 is a group III base oil. I was unsure how it would do at 8500 mile OCI. Not alot of Castrol 0w 40 users here to get information UOA about.

 

[Hirev]

hungdynasty I spent many hours trying to find out if the RS in the US was a goup III and never found out for sure. I assumed because Castrol RS was sold in the US it was a Group III, my mistake.

Patman do you think the Castrol RS sold in the USA is the same formula as Castrol RS in Europe? Or is it like the 0w 30 Syntec USA vs German made SLX deal, 2 different formulas for the same weight? Its been some time since I looked but it seemed like the USA Castrol RS was made in USA.

 

[hungdynasty]

And what I heard is that BP Visco 7000 0W40 is just the same as Castrol RS 0W40(I think BP owns Castrol, doesn't it?)

BP VISCO 7000 0W40

 

[pscholte]

quote:

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Originally posted by hungdynasty:
And what I heard is that BP Visco 7000 0W40 is just the same as Castrol RS 0W40(I think BP owns Castrol, doesn't it?)

BP VISCO 7000 0W40

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Interesting...maybe it is old data...but Visco 7000 is MB 229.1 and SLX is 229.3

 

[Quattro Pete]

quote:

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Originally posted by Patman:
I don't think Castrol 0w40 uses a group 3 base at all, otherwise they couldn't label it synthetic in Europe.

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What about Castrol GTX Magnatec 5w-40, which is believed to be the Belgian Castrol? Didn't someone say that this one uses group 3 base? Yet on the European bottle of GTX Magnatec it says "Fully Synthetic".

Of course there is a possibility that Magnatec 5w-40 is not the same as Belgian Castrol. Anyone know for sure? FYI, GTX Magnatec 5w-40 meets API SL/CF, ACEA A3/B3/B4, MB 229.31, VW 502.00/505.00.

 

[Quattro Pete]

quote:

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Originally posted by hungdynasty:
Looks to me the Castrol RS is better, isn't it?

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Impossible to tell just by looking at these specs. Too many factors to consider. Do some UOAs and find out.

 

[Hirev]

hungdynasty, You are right BP owns Castrol. From what understand the R&D for Castrol oils is done by BP now days. So the Visco 7000 and Castrol RS could be interlinked.

Seems like read somewhere MB spec for current MB is 229.5 now. They must be changing every year or 2 now. So it could be old data.

Sure know I would be like to find the best 0w 40.

 

[Patman]

quote:

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Originally posted by Hirev:


Patman do you think the Castrol RS sold in the USA is the same formula as Castrol RS in Europe? Or is it like the 0w 30 Syntec USA vs German made SLX deal, 2 different formulas for the same weight? Its been some time since I looked but it seemed like the USA Castrol RS was made in USA.

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I didn't even know that Castrol 0w40 was sold in the US. Where can it be purchased? I didn't see any in Autozone when I was in Michigan this weekend.

 

[pscholte]

quote:

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Originally posted by Hirev:
Seems like read somewhere MB spec for current MB is 229.5 now. They must be changing every year or 2 now. So it could be old data.

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Hirev,

(The following thanks to whnet.com

quote:

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MB sheet 229.5 approved oils; "MB Longlife Service Oils"...for passenger cars with gas and diesel engines with extended drain intervals beyond 229.3 oils, to 30,000 km, min 1.8% fuel saving, first oils introduced summer 2002. For gas engines of the M100 series, gas engines of the M200 series and diesel engines of the OM600 series (not models with Euro 4 diesel particle filters).
229.5 engine oils must be used with fleece oil filter designed for use with 229.5 engine oils.

MB sheet 229.3 approved oils
for passenger cars with gas and diesel engines with extended drain interval indicator FSS up to 20,000 km, or 40,000 km - 25,000 mi, min. 1.0% fuel saving compared to 229.1, based on ACEA A3 B3. For gas engine of the M100 series, gas engines of the M200 series and diesel engines of the OM600 series (not models with Euro 4 diesel particle filters).

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They are concurrent specs with different performance parameters. When I said the website might be out of date I meant that Visco 7000 might now be 229.3 qualified and they just had not posted that.

 

[Losiho]

Formula R / RS 0w40 is NOT Group 3, it is 100% Group 4 PAO. Sounds like the North American Castrol 0w40 is not the real deal.

 

[Hirev]

Patman, I seen the 0w 40 at a local small auto parts place last spring. Thinking about it I don't think I have seen it any where else. I hope its not like the GC deal. I never seen a live bottle of GC at my local autozone or anywhere.

 

[hungdynasty]

Hi Hirev do you have any info about Castrol RS is a group III? I know Castrol Syntec in North America is a group III, but never find any info about European formula Castrol RS. All I know is that their 0W30 is called SLX, 0W40 and 10W60 are called RS.

 

[Patman]

I don't think Castrol 0w40 uses a group 3 base at all, otherwise they couldn't label it synthetic in Europe.

I've always assumed that Castrol's 0w40 was very close to SLX 0w30 but with perhaps a tiny bit of VII added to bump it slightly into the 40wt range. It's not much thicker at 100C than SLX actually (it's 12.9 vs 12.2)

 

[hungdynasty]

quote:

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the Castrol is a little thinner

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Stupid question. When we look at the cSt @ 100º C, Mobil1 is 14.3 and RS is 12.9, so Mobil1 is thicker. But if we look at the HTHS Viscosity, Mobil1 is 3.6 and RS is 3.7, so RS is thicker. Which one is right?

 

[Losiho]

I'm not sure where you obtained that HTHS number from, Castrol Australia lists the HTHS for Castrol Formula R 0w40 as 3.6, the same as M1 0w40.

 

[MGBV8]

Magnatec in UK is not branded as fully synth but uses esters in blend.

Shell Fully Synth 0W 40 should also be a PAO base