Quick guide thanks to upontheriversky to get most people started:
2) Viscosity index - oil ability to behave at rated viscosity at wide range of temperatures. Higher number means higher viscosity stability. important for high heat engine - turbos and high rev NA. lower number means, the viscosity will change a lot from what stated at the back of bottle at different oil temperature than 40 and 100 celcius so it is not good.
3) NOACK volatility - oil weight loss due to evaporation, the number is in percentage. the lower the better. important for turbos coz even branded oil may have high NOACK number which contributes to oil evaporation even in no-leak engines. As oil evaporates, the lighter weight will give up first, leaving the heavier oil so oil becomes thicker and less performance.
4) High temp/high shear viscosity - oil ability to sustain the mentioned condition, the higher the better. most important for turbos and racing engines.
5) Total Base Number - this is the most important feature for all average users like me to see whether the oil can actually be used for long time or not. this is the reserved alkalinity to resist fuel dilution of engine oil from combustion. Fuel dilution makes the oil acidic and therefore oxidized faster. The higher the better. Higher TBN also usually means the oil has lots of detergent which is good for engine cleanliness. Amsoil has the highest as far as i know. So there is no need for rigid classification of fully syn has to be changed at 10k, semi at 7k and so on, look at the TBN and do ur own comparison. Whatever close to 10 is good, higher is best and lower is so-so only. minimum would be 7-8 as dictated by SAE if im not mistaken
To sum up, 0w20 oil may be very thin but if the Viscosity Index and NOACK is really good, u wont experience as much oil loss or bad engine wear as compared to 10w30 having really bad NOACK and Viscosity Index. The specs are there, we just need to learn how to interpret so that we can all stop beating the bush when it comes to what oil is suitable for our application.
For enthusiast/speed chaser:
- pay attention to all specs mentioned above
For average daily drive and normal maintenance:
- pay particular attention to Total Base Number
If the brand of oil you are comparing does not provide any of the info above, it can simply means that the oil did not pass the test or the test result is not impressive that they hide it so people would still buy. We wont be able to say its bad until we see bad test numbers, so hide it and call it good stuff, people will still buy and call it good. Its all about sales in the end
for example, try see castrol oil spec whether they have half of the specs i mentioned above and see amsoil, redline and torco specs on the web, these branded oil have nothing to hide
The above is exactly why i stress on proper certification (eg: API) and proper lab analysis/testing/data sheets/technical specs.
Wiki on Engine Oil
API Engine Oil Classifications (from infineum)
How much does it cost/royalty fee to get an engine oil certified?
Full documentation on API Licensing/certification/tests
ILSAC GF-5 specifications:
PQI America (good site with oil analysis from EO bought off shelves at random)
BITOG (bob is the oil guy website/forums)
Acceptable levels of wear/guides on oil analysis
Blackstone Labs - one of the more popular labs used by many BITOG members for their oil analysis
explanation on BSL reports:
API Licencing directory query (very useful to determine whether an Engine oil is actually certified)
old v1 link:
props to upontheriversky upon taking the initiative to learn and debunk on old theories/traditional thoughts.
noticed how many of us were young/unknowing (including myself!)
and this is me staying true to my words
some information i have compiled on gear lubrication (for the F5MBB only though):
some GTL discussion (shell/pennzoil pureplus):
Motorcycle / Bike Section
main website of JASO:
Motorcycle 4T section of JASO:
JASO certification application manual, includes classification details and test methods etc:
List of JASO certified lubricants:
updated 1st February 2016, so most of the previously printed lubricant on the market may not match this list
external information for JASO:
further details for JASO MA/MB classifications:
Motorcycle / Bike Front fork/Suspensions fluid (or oil) viscosity charts:
Motorcycle / Bike chain videos:
Myth of chain lube - wear and tear explained:
WBW chain lube application reviews:
Chain lube research paper - comparing wax, PTFE, drip oil and un-lubed chain wear:
bike chain videos and research paper links thanks to forum member alexei
This post has been edited by Quazacolt: Dec 29 2017, 04:12 AM