Castrol Formula R 0W40

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Jun 10, 2002
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How much was it, in comparison the Mobil 1 and Castrol Syntec? I'd say if it meets those specs, it probably doesn't matter what it's made from, though it's probably Group IV/V.
 
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THe Castrol Formula RS is a real synthetic unlike the new Magnatec, as its a group III. Also, one of the GTX's (in Europe at least) is also a group III, so be careful! You CAN'T go wrong IMHO though, w/ Castrol's Formula RS. The only Formula RS we can buy here in the states is the 10w-60. Whoopie! What am I gonna use that in @ $13 usd/qt?
 

MolaKule

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The link that Joee provided is for Castrol R 0W40, didn't say anything about an RS. Unless we see an MSDS sheet, I am going to assume its a majority Group III base with low levels of PAO and maybe some esters. In other words, without the MSDS, it appears to be a blend.
 
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Molakule: I would suggest that either its is a re-named product (i.e. RS-the 'S') or, its a typo. And yes, I still say its a real syn. because of the way oils are marketed there. I know that in Germany, where they are required to specify (ie. HC Synthetics or Full Synthetics) type of oil, its listed a a full syn. and not an HC syn. Of course this may only be in Germany. However, I do ask this: "Is the Formula 'R' available in a 10w-60 too.?" If so then, this would probably be the formulation as sold in Europe. Perhaps, and perhaps not.
 

sprintman

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Yup 10W60 and 5W30. I'm surprised it's 5W30 and not 10W30 as Mobil Oz said 0W30 and 5W30 are useless! Still Castrol must think differently. The oil is about A$85 for a 5.28 US quart (5 litres) jug. Thats more than M1 0W40 and I know which I prefer.
 
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Jason, You will note that the kinematic viscosity @ 100C is 12.9 centistokes, so this is barely a 40wt grade. This is why the HT/HS is only 3.6. Cp. This is typical of many of the 0w-40, "Euro" synthetics intended for passenger car use. They are formulated just thick enough to meet the ACEA A3/B4 requirement of 3.5 Cp for HT/HS viscosity. The 0w-40, Mobil 1 Tri-synthetic had a HT/HS of 3.55 Cp for example. TS
 
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Originally Posted By: used_0il
Yeah, those early 0W40s were quite thin. Now we have 5W30s with HTHS of 3.6
Duuude, this thread was 13 years old! What are you doing!? crazy ~ Triton
 
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Originally Posted By: used_0il
Yeah, those early 0W40s were quite thin. Now we have 5W30s with HTHS of 3.6
I used that one back in the day, in my diesel Nissan, because it was a 40, and it was thin (hmmm, not what I'm accused of normally).
 
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