Castrol GPS Syn
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Outstanding HDF Member
Joined: May 2006
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Castrol GPS Syn
I was in a Cycle Gear store today. They carry a good selection of oil and filters that I am used to seeing and use. I did notice Castrol GPS syn for air cooled V-twins. Anyone have any feed back on Castrol for bikes?
Cruiser
Joined: Jun 2006
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RE: Castrol GPS Syn
There is a comprehensive study done by AMSOIL of synthetic oils formulated for use in Motorcycle Engines . There are 16 oils evaluated and Castrol GPS is rated 15 out of 16. Harley Syn 3 is rated #6 and no one seems to like it. The Top oils are AMSOIL 20W50 and Mobil One V Twin. A lot of folks here like Redline but it is not formulated for use in Motorcycle engines but it seems to do just fine. You can view the study at www.amsoil.com . It is located on the lower right hand side of the page in Yellow. You may do as you wish but I wouldn't put Castrol in anything I own IMHO
03 Ultra Classic
AMSOIL 20W50 Engine and Primary
Aevere Gear 75W90 in the Trans.
03 Ultra Classic
AMSOIL 20W50 Engine and Primary
Aevere Gear 75W90 in the Trans.
Tourer
Joined: May 2005
Posts: 466
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From: Canada
RE: Castrol GPS Syn
I would go with Mobile 1 V-Twin 20w-50 in the motor and the primary but Mobile 1 75w-90 in the tranny. Do not use the same oil you use for the motor for the tranny. This gets beat to death on here (I was told that when I asked) but this is what I did learn from my reshearch both here and elsewhere...mobile 1 V-Twin 20w-50 and 75w-90 is good stuff. I also agree with Pococj we are most likely paying to much for the Mobile 1 V-Twin 20w-50 and that the Mobile 1 car oil is fine but I have not tried that yet myself. Please pay attention to who runs that there oil test bear95252 points you to...you may notice it's AMSOIL.COM[sm=bangbang.gif][sm=lildevil.gif]
Cruiser
Joined: Jun 2006
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RE: Castrol GPS Syn
I have no intention of starting a peeing contest over oil. I will point out some very important facts that seem to always be omitted. First of all the Oil Study i referred you to on AMSOIL .com is the only factual comprehensive test available that i know of anywhere on the net. If anyone else knows of another one, please set me straight.
The test was commissioned by AMSOIL and was conducted by and independent laboratory using FEDERAL ASTM TESTING STANDARDS which insures that the test results can be duplicated by any lab using these standards. There is an affidavit of authenticity also included in the study.
There are six primary differences between motorcycle and automotive engine applications:
1. Operational Speed ( Motorcycle Engine RPM’s are ‘significantly higher. This creates higher shear forces, promotes foaming which can reduce an oil’s load carrying ability and accelerate oxidation.
2. Compression ratios: Motorcycle engines tend to operate with higher compression ratios which promotes higher operating temps which promotes thermal degradation of the oil, reduces its life expectancy and increases the formation of internal engine deposits.
3.Horsepower/ Displacement Density: Motorcycle engines produce nearly twice the horsepower per cubic inch of displacement of automobile engines. This exposes the lubricating oil to temps and stress.
4.Variable Engine Cooling: Many Motorcycles are air-cooled and use a combination air/oil design. Though effective, they result in greater fluctuations in operating temperatures, particularly when motorcycles are operated in stop-and-go traffic. Elevated operating temps promote oxidation and causes oils to thin, reducing their load carrying ability.
5. Multiple Lubrication Functionality; Many Motorcycles have a common sump supplying oil to both engine and transmission. In such cases the oil is required to meet the requirements of both the Engine and transmission gears. Many Motorcycles incorporate a frictional clutch within the transmission that uses the same oil.
6. Inactivity; Motorcycles are typically used less frequently than automobiles , sometimes seasonal, In these circumstances, rust and acid corrosion protection are of critical importance.
It should be apparent that motorcycle applications place a different set of requirements on lubricating oils. Motorcycle oils, there fore, must be formulated to address this unique set of high stress conditions.
Finally let me say that Mobile one V Twin IS formulated for use in Motorcycles, Mobile One Car oil is not. I cools never understand why someone would pay $20,000 plus for a motorcycle and then go for cheap on the oil.
May I humbly suggest that what ever oil you choose, make your decision based on fact rather than conjecture
The test was commissioned by AMSOIL and was conducted by and independent laboratory using FEDERAL ASTM TESTING STANDARDS which insures that the test results can be duplicated by any lab using these standards. There is an affidavit of authenticity also included in the study.
There are six primary differences between motorcycle and automotive engine applications:
1. Operational Speed ( Motorcycle Engine RPM’s are ‘significantly higher. This creates higher shear forces, promotes foaming which can reduce an oil’s load carrying ability and accelerate oxidation.
2. Compression ratios: Motorcycle engines tend to operate with higher compression ratios which promotes higher operating temps which promotes thermal degradation of the oil, reduces its life expectancy and increases the formation of internal engine deposits.
3.Horsepower/ Displacement Density: Motorcycle engines produce nearly twice the horsepower per cubic inch of displacement of automobile engines. This exposes the lubricating oil to temps and stress.
4.Variable Engine Cooling: Many Motorcycles are air-cooled and use a combination air/oil design. Though effective, they result in greater fluctuations in operating temperatures, particularly when motorcycles are operated in stop-and-go traffic. Elevated operating temps promote oxidation and causes oils to thin, reducing their load carrying ability.
5. Multiple Lubrication Functionality; Many Motorcycles have a common sump supplying oil to both engine and transmission. In such cases the oil is required to meet the requirements of both the Engine and transmission gears. Many Motorcycles incorporate a frictional clutch within the transmission that uses the same oil.
6. Inactivity; Motorcycles are typically used less frequently than automobiles , sometimes seasonal, In these circumstances, rust and acid corrosion protection are of critical importance.
It should be apparent that motorcycle applications place a different set of requirements on lubricating oils. Motorcycle oils, there fore, must be formulated to address this unique set of high stress conditions.
Finally let me say that Mobile one V Twin IS formulated for use in Motorcycles, Mobile One Car oil is not. I cools never understand why someone would pay $20,000 plus for a motorcycle and then go for cheap on the oil.
May I humbly suggest that what ever oil you choose, make your decision based on fact rather than conjecture
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