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oil test
- Thread starter bluep
- Start date
JayBros
Well-known member
Extrapolate from the cSt100 scale to the SAE engine oil scale on the link and you'll see that 12.2 is equal to a high 30 weight viscosity.
http://www.bobistheoilguy.com/viscosity-charts/
Viscosity shearing is explained in this link, fifth bullet from BRPCare.
http://www.spyderlovers.com/forums/showthread.php?82580-Oil-Level-on
How many miles you have on the load of oil gives you an idea how well it is resisting shearing based on the degradation explained in the second link. If you have multiple thousand miles on the oil it is doing very well.
http://www.bobistheoilguy.com/viscosity-charts/
Viscosity shearing is explained in this link, fifth bullet from BRPCare.
http://www.spyderlovers.com/forums/showthread.php?82580-Oil-Level-on
How many miles you have on the load of oil gives you an idea how well it is resisting shearing based on the degradation explained in the second link. If you have multiple thousand miles on the oil it is doing very well.
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Highwayman2013
New member
I'm doing a test on new BRP oil vs used BRP oil (4600miles). I thought it would be interesting to see what viscosity the new oil starts at. Samples are at the lab now and I am awaiting results.
BLUEKNIGHT911
Sadly Passed Oct 2024 - RIP
Highwayman2013
New member
You're welcome Mike, just want to get a baseline.
JayBros
Well-known member
If you're testing XPS synthetic blend 5W-40 right out of the sealed jug I think you'll find it's exactly as claimed, 5W-40. BRP would be absolute fools, which I don't think they are, to attempt selling an oil product that isn't what they claim to be -- way too much to lose legally. Then again...
To be completely unbiased on the original oil, samples from the same jug should be sent to at least two different labs. JMO.
To be completely unbiased on the original oil, samples from the same jug should be sent to at least two different labs. JMO.
Highwayman2013
New member
Just want to get where the viscosity falls in the range. Is it a high 40 or a low 40.
Highwayman2013
New member
OK so here is fresh BRP XPS blended oil. It shows as a mid 40 weight.
Tango
Well-known member
Am I reading that base number correctly? :dontknow: 6.5? That's piss poor IMO! :thumbup: Tom :spyder:
Highwayman2013
New member
I don't know about how high it should be but the way it looks after 4600 miles in a 998 engine is what I'm after.
JayBros
Well-known member
I'm way out on a limb with the chainsaw fired up but I think the base number you are citing is not significant in the viscosity discussion. Suggest you check this link http://www.machinerylubrication.com/Read/1052/acid-number-test and you'll see that the 6.5 does not represent the absolute acid concentration of the oil sample.
Your reference refers to the Acid Number which is a measure of the acidity in the oil, not Total Base Number. Total Base number is the reserve alakalinity available to counter future acid generation. Below are several excerpts from different sources explaining TBN. For reference, when I checked TBN on Amsoil 10/40 after 8100 miles in a 998 RT, it was 6.1. Amsoil states their 10/40 as shipped would have a typical TBN of 11.1. Not promoting Amsoil -- these are just points of reference to be added to the other data in this thread. Here are some excerpts on TBN:
From Blackstone Laboratories:
[SIZE=-1]In short, a TBN (total base number) measures the amount of active additive left in a sample of oil. The TBN is useful for people who want to extend their oil usage far beyond the normal range.[/SIZE]
[SIZE=-1]The TBN of a used oil can aid the user in determining how much reserve additive the oil has left to neutralize acids. The lower the TBN reading, the less active additive the oil has left. [SIZE=-1]The TBN will start out reading in the 6.0 to 14.0 range (depending on whether the oil is for gas or diesel engines). When you first start using the oil the TBN tends to drop sharply. Then it levels out and drops more slowly after that. A low TBN test result, meaning very little additive is left, is down around 1.0 or lower.
From Amsoil:
Generally speaking, the higher an oil’s total base number (TBN), the better its ability to neutralize contaminants such as combustion by-products and acidic materials. TBN is a measure of (alkaline) additives in the oil. Higher TBN oils are able to neutralize a greater amount of acidic materials, which results in improved protection against corrosive reactions and longer oil life.
[/SIZE][/SIZE]
TBN levels decrease as the oil remains in service. When the level reaches a point where it can no longer protect against corrosion, the oil must be changed.From Amsoil:
Generally speaking, the higher an oil’s total base number (TBN), the better its ability to neutralize contaminants such as combustion by-products and acidic materials. TBN is a measure of (alkaline) additives in the oil. Higher TBN oils are able to neutralize a greater amount of acidic materials, which results in improved protection against corrosive reactions and longer oil life.
[/SIZE][/SIZE]
Oils that are formulated specifically for extended drain intervals typically display elevated TBN to ensure proper corrosion protection for the duration of the extended interval.
From the Petroleum Quality Institute:
Total base number (TBN) is a measure of a reserve alkalinity of a lubricant. The test is relevant to internal combustion engines due to the acidic byproducts of combustion generated when gasoline and diesel fuel are burned. ...Whereas the process of generating acids will continue for the life of the engine, the ability of engine oil to neutralize the acids is finite. This is one reason engine oil needs to be changed. The basic properties of engine oil are eventually overcome by the constant generation of acids and the oil must be changed before the lubricant loses its ability to neutralize the acids. ...It should be noted that like "Tums: too much of anything is not necessarily good. In fact, whereas an overtreat of calcium sulfonate may be beneficial in neutralizing the acidic by-product of combustion, too much can generate higher levels of ash which can be damaging to an engine. In an effort to strike a balance, the total base number of a new oil is typically in the range of 7 to 10 for gas engines and 10 to 14 for diesel engines. When the TBN in a used oil drops below 3, it typically indicates the need for an oil change.
More than you ever wanted to know.
I was pleased it was still a respectable 6.1 after 8100 miles. The two references indicated you have a concern when it's less than 3 or less than 1 (take your pick). I did this test when changing the oil after a run to Alaska and was very pleased it held up that well for 8100 miles in a 998. Maybe it dropped a lot but where would it be if it had started out low?
ulflyer
Active member
Compare Viscosity and TBN
I would still want to consider how well the viscosity held up along with the TBN numbers. The above article is totally true but its mainly oriented towards auto's, none of which share oil with their gearbox's llike our Rotax motors do...and shear like crazy.
I would still want to consider how well the viscosity held up along with the TBN numbers. The above article is totally true but its mainly oriented towards auto's, none of which share oil with their gearbox's llike our Rotax motors do...and shear like crazy.
No one is suggesting ignoring viscosity. Just trying to provide background info on another parameter -- TBN.
pjweimer
Member
Amsoil 10W40 w/ 9,967 miles results
Just got this report yesterday from Oil Analyzers, Inc. in Indianapolis.
View attachment CANAM-SPYDER-E-I-046359-Sev2.pdf
Just got this report yesterday from Oil Analyzers, Inc. in Indianapolis.
View attachment CANAM-SPYDER-E-I-046359-Sev2.pdf
Highwayman2013
New member
That oil held up well with that mileage. Looks like it holds up much better than the BRP stuff. I think I'm going with the Amsoil on the next change.
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ulflyer
Active member
Nice report. Viscosity was down to mid-30 and TBN numbers still good. I don't get their comment about magnesium; its a
wear additive and that number, 54, is about right for the Amsoil 10-40 that I've tested. Some oils use much less and others much much higher, 859 in a Castrol Blend in one test I did. Considering the fuel dilution, I'd suggest changing a bit earlier next time, perhaps around 8K, and see how that tests out. OVerall, super report and thanks for sharing. I've been wanting to see more long term reports and you've added to our knowledge base.
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