oil
03 January 2005, 12:57 PM
#3
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The 3 biggies seem to be (fully synthetic) Mobil 1 motorsport 15w50, Castrol RS 10w60 and Motul 300v 15w50, though if you use a subaru dealer they will probably use (semi synthetic) Shell 10w40 or similar.
Tony
PS, i wouldnt use a 5 rated oil, a little too thin for normal use (even subaru say that!)
Tony
PS, i wouldnt use a 5 rated oil, a little too thin for normal use (even subaru say that!)
03 January 2005, 04:09 PM
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Originally Posted by TonyBurns
PS, i wouldnt use a 5 rated oil, a little too thin for normal use (even subaru say that!)
SWRT uses 300V 5W-40 Power in Subaru WRC's
..and try to use 15W-50 and 10W-60 in wintertime when temps can drop even -30'C in Finland :-P
Last edited by malinen; 03 January 2005 at 04:13 PM.
03 January 2005, 04:29 PM
#5
Actually 5w-40 is fine. The pick of the bunch is Motul 300V 5w-40 or Silkolene PRO S 5w-40. Both ester based proper synthetics.
Castrol RS 10w-60 is too thick though in my opinion expressed here on more than one occassion and, Subaru UK were baffled by it's use when I spoke to them.
They recommended a minimum quality of 10w-40 semi-synthetic, personally I would stick to synthetics as they're better.
Cheers
Simon
Castrol RS 10w-60 is too thick though in my opinion expressed here on more than one occassion and, Subaru UK were baffled by it's use when I spoke to them.
They recommended a minimum quality of 10w-40 semi-synthetic, personally I would stick to synthetics as they're better.
Cheers
Simon
03 January 2005, 08:04 PM
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Originally Posted by malinen
Actually they don't, my manual states 5W-40 is perfectly okay in STI v8
SWRT uses 300V 5W-40 Power in Subaru WRC's
..and try to use 15W-50 and 10W-60 in wintertime when temps can drop even -30'C in Finland :-P
SWRT uses 300V 5W-40 Power in Subaru WRC's
..and try to use 15W-50 and 10W-60 in wintertime when temps can drop even -30'C in Finland :-P
My car is an MY03 JDM STi, the book doesnt recommend any 5w rated oil, the minimum is the 10w40 semi synthetic, though there is the cold weather useage of a 5w30, but you have to read the big warning section on its use!!
STi also do their own named oil (its actually Motul 300v 15w50) but as stated, you say SWRT uses a 5w40 in their rally cars, note how long it is between rebuilds? 1k!!
Tony
03 January 2005, 08:28 PM
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Originally Posted by TonyBurns
your manual must be different to mine
My car is an MY03 JDM STi, the book doesnt recommend any 5w rated oil, the minimum is the 10w40 semi synthetic, though there is the cold weather useage of a 5w30, but you have to read the big warning section on its use!!
STi also do their own named oil (its actually Motul 300v 15w50) but as stated, you say SWRT uses a 5w40 in their rally cars, note how long it is between rebuilds? 1k!!
Tony
My car is an MY03 JDM STi, the book doesnt recommend any 5w rated oil, the minimum is the 10w40 semi synthetic, though there is the cold weather useage of a 5w30, but you have to read the big warning section on its use!!
STi also do their own named oil (its actually Motul 300v 15w50) but as stated, you say SWRT uses a 5w40 in their rally cars, note how long it is between rebuilds? 1k!!
Tony
Actually 5W-30 is recommended in the manual !
Allowed viscosities: 30, 40 10w-50, 20W-40, 20W-50
API SL, SJ, SH and SG... Motul 300V 5W-40 Power meets API SG
And in my use top quality 5W-40 synthetic is more than enough... and as I said, try running 15W-50 in cold starts if temp falls below -20'C or -30'C.
Usually at summertime i have used Motul 10W-40 Chrono or Redline 10W-40
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03 January 2005, 08:29 PM
#8
I'm not sure of the logic here.
Are you suggesting metal to metal contact with a 5w-40? I think not.
A 5w-40 is the same thickness as the "Subaru" recommended 10w-40 semi-synthetic when hot, it's still an sae 40.
The only difference is better cold start viscosity and the fact that a 5w is more likely to be a proper synthetic oil to reach the API -30 degC pour point test than a cheap semi synthetic hydrocracked 10w-40.
The point here is if Subaru are only recommending a minimum quality of 10w-40 semi-synthetic then how hard can the "scoob" be on its oil?
Not too hard really as this oil is in a completely different league performance-wise to a proper PAO/Ester synthetic 10w-40, 5w-40, 15w-50 or whatever.
So, are synthetics necessary? If you listen to Subaru, the answer is clearly no but don't we all want to do the best for our cars and that's the point!
I know which one I would use without question as it's a no-brainer.
Cheers
Simon
Are you suggesting metal to metal contact with a 5w-40? I think not.
A 5w-40 is the same thickness as the "Subaru" recommended 10w-40 semi-synthetic when hot, it's still an sae 40.
The only difference is better cold start viscosity and the fact that a 5w is more likely to be a proper synthetic oil to reach the API -30 degC pour point test than a cheap semi synthetic hydrocracked 10w-40.
The point here is if Subaru are only recommending a minimum quality of 10w-40 semi-synthetic then how hard can the "scoob" be on its oil?
Not too hard really as this oil is in a completely different league performance-wise to a proper PAO/Ester synthetic 10w-40, 5w-40, 15w-50 or whatever.
So, are synthetics necessary? If you listen to Subaru, the answer is clearly no but don't we all want to do the best for our cars and that's the point!
I know which one I would use without question as it's a no-brainer.
Cheers
Simon
03 January 2005, 08:36 PM
#9
I did some thorough research on this a while back and these were my findings:
As far as I'm concerned, the definitive answers are here (although others may disagree)
Well, I've got recommendations from three seperate companies who are all experts in oil.
1. Silkolene Technical Department
2. Motul Technical Department
3. OATS - The largest proprietory oil recommendation database in the UK.
And, these were the recommendations that I recieved from them:
Impreza 2.0i Sport 1996-00
Motul 5w-40 or 10w-40
Silkolene 5w-40 or 10w-40
OATS 10w-40
Impreza 2.5i 4WD 2001 onwards
Motul 5w-30 or 5w-40
Silkolene 5w-40
OATS 5w-30 or 5w-40
Impreza 2.0i WRX/STi Turbo 2001 onwards
Motul 5w-30 or 5w-40
Silkolene 5w-40
OATS 5w-30 or 5w-40
Impreza 2.0i Turbo 1994-00
Motul 5w-40 or 10w-40
Silkolene 5w-40
OATS 10w-40
Impreza 2.0 4WD 2000 onwards
Motul 0w-30, 0w-40, 5w-30 or 5w-40
Silkolene 5w-30 or 5w-40
OATS 5w-30 or 5w-40
Impreza 1.6i, 1.8i 4WD 1993-96
Motul 5w-40 or 10w-40
Silkolene 10w-40
OATS 10w-40
I also spoke to Subaru UK's technical helpline this week and they recommend a MINIMUM quality of 10w-40 semi-synthetic but also recommend 5w-40 fully synthetic and 10w-40 fully synthetic as higher quality options.
Cheers
Simon
As far as I'm concerned, the definitive answers are here (although others may disagree)
Well, I've got recommendations from three seperate companies who are all experts in oil.
1. Silkolene Technical Department
2. Motul Technical Department
3. OATS - The largest proprietory oil recommendation database in the UK.
And, these were the recommendations that I recieved from them:
Impreza 2.0i Sport 1996-00
Motul 5w-40 or 10w-40
Silkolene 5w-40 or 10w-40
OATS 10w-40
Impreza 2.5i 4WD 2001 onwards
Motul 5w-30 or 5w-40
Silkolene 5w-40
OATS 5w-30 or 5w-40
Impreza 2.0i WRX/STi Turbo 2001 onwards
Motul 5w-30 or 5w-40
Silkolene 5w-40
OATS 5w-30 or 5w-40
Impreza 2.0i Turbo 1994-00
Motul 5w-40 or 10w-40
Silkolene 5w-40
OATS 10w-40
Impreza 2.0 4WD 2000 onwards
Motul 0w-30, 0w-40, 5w-30 or 5w-40
Silkolene 5w-30 or 5w-40
OATS 5w-30 or 5w-40
Impreza 1.6i, 1.8i 4WD 1993-96
Motul 5w-40 or 10w-40
Silkolene 10w-40
OATS 10w-40
I also spoke to Subaru UK's technical helpline this week and they recommend a MINIMUM quality of 10w-40 semi-synthetic but also recommend 5w-40 fully synthetic and 10w-40 fully synthetic as higher quality options.
Cheers
Simon
03 January 2005, 08:37 PM
#10
Originally Posted by TonyBurns
your manual must be different to mine
My car is an MY03 JDM STi, the book doesnt recommend any 5w rated oil, the minimum is the 10w40 semi synthetic, though there is the cold weather useage of a 5w30, but you have to read the big warning section on its use!!
STi also do their own named oil (its actually Motul 300v 15w50) but as stated, you say SWRT uses a 5w40 in their rally cars, note how long it is between rebuilds? 1k!!
Tony
My car is an MY03 JDM STi, the book doesnt recommend any 5w rated oil, the minimum is the 10w40 semi synthetic, though there is the cold weather useage of a 5w30, but you have to read the big warning section on its use!!
STi also do their own named oil (its actually Motul 300v 15w50) but as stated, you say SWRT uses a 5w40 in their rally cars, note how long it is between rebuilds? 1k!!
Tony
In terms of SWRT using 5/40 - seems quite logical for good power release and with an external oil cooler would not reach an excessive temperature? and would they not re-build every 1k irrespective of what lubricant was used?
JohnD
03 January 2005, 08:43 PM
#11
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John,
My handbook still states as did the MY00 turbo before it that its from 0 to -40 for the 5w30 oil, but you are right about the lubricant for SWRT, they probably just need to get the heat in there quickly, though its not the sort of oil id be using if i wanted an engine to reach 100k without much wear! (or high speed useage!) without an oil cooler (which subarus dont come with, unless its a type ra or spec c). Me, i shall stick to what Subaru Japan state is good on their cars (probably because it is a JDM car), which is pretty similar to what the classic turbo's had stated for their oil.
Tony
My handbook still states as did the MY00 turbo before it that its from 0 to -40 for the 5w30 oil, but you are right about the lubricant for SWRT, they probably just need to get the heat in there quickly, though its not the sort of oil id be using if i wanted an engine to reach 100k without much wear! (or high speed useage!) without an oil cooler (which subarus dont come with, unless its a type ra or spec c
). Me, i shall stick to what Subaru Japan state is good on their cars (probably because it is a JDM car), which is pretty similar to what the classic turbo's had stated for their oil.Tony
03 January 2005, 08:48 PM
#12
Actually they use it because it's a top oil and being ester based it will withstand excessive temperatures as it's extremely thermally stable. Basically they need an oil that will not shear down quicky with use and this oil meets the criteria.
http://www.opieoils.co.uk/TechSpecs/.../300VPower.pdf
A reminder of why esters are preferred in competition circles:
Esters
All jet engines are lubricated with synthetic esters, and have been for 50 years, but these expensive fluids only started to appear in petrol engine oils about 20 years ago. Thanks to their aviation origins, the types suitable for lubricants (esters also appear in perfumes; they are different!) work well from –50 degC to 200 degC, and they have a useful extra trick.
Due to their structure, ester molecules are “polar”; they stick to metal surfaces using electrostatic forces. This means that a protective layer is there at all times, even during that crucial start-up period. This helps to protect cams, gears, piston rings and valve train components, where lubrication is “boundary” rather than “hydrodynamic”, i.e. a very thin non-pressure fed film has to hold the surface apart. Even crank bearings benefit at starts, stops or when extreme shock loads upset the “hydrodynamic” film.
Cheers
Simon
http://www.opieoils.co.uk/TechSpecs/.../300VPower.pdf
A reminder of why esters are preferred in competition circles:
Esters
All jet engines are lubricated with synthetic esters, and have been for 50 years, but these expensive fluids only started to appear in petrol engine oils about 20 years ago. Thanks to their aviation origins, the types suitable for lubricants (esters also appear in perfumes; they are different!) work well from –50 degC to 200 degC, and they have a useful extra trick.
Due to their structure, ester molecules are “polar”; they stick to metal surfaces using electrostatic forces. This means that a protective layer is there at all times, even during that crucial start-up period. This helps to protect cams, gears, piston rings and valve train components, where lubrication is “boundary” rather than “hydrodynamic”, i.e. a very thin non-pressure fed film has to hold the surface apart. Even crank bearings benefit at starts, stops or when extreme shock loads upset the “hydrodynamic” film.
Cheers
Simon
03 January 2005, 08:58 PM
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Originally Posted by oilman
Due to their structure, ester molecules are “polar”; they stick to metal surfaces using electrostatic forces. This means that a protective layer is there at all times, even during that crucial start-up period. This helps to protect cams, gears, piston rings and valve train components, where lubrication is “boundary” rather than “hydrodynamic”, i.e. a very thin non-pressure fed film has to hold the surface apart. Even crank bearings benefit at starts, stops or when extreme shock loads upset the “hydrodynamic” film.
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