Seasonal motocross/enduro riders have had many complaints from moisture causing problems inside crankcases. In Australia still offers 3 oils...hp(regular dino fb), HP semi synth GD/FD and the expensive full synthetic HP ultra FB/GB. Why sleeper does the fully 100% synthetic only offer an FB rating which is the same as their cheap old dino stuff??? Why is the semi synthetic a FD rated oil???? As far as I understood, Stihl HP ultra, is marked only as FB because it fullfills the "blue angel" award as very environment friedly(80% deterioration in 21 days). I assume that that has to do with the rating.
Why does Belray 100% ester full synthetic HR1 not even put a rating on their oil???? Starting to get the drift yet??? Stop listening to marketing!!
The funny thing is that the international norms are never used for marketing, as far as I have seen! They are often just standing there out of "accident" it seems. Because no one knows what they mean and what they don't mean. So if a company chooses to have it's oil tested or not is simply, it often seems, a coincidence.
Those who know and understand what norms are can use them accordingly. But of course they are never the saviour. I propogate them because they are often the only objective measurement for uninformed to oriente their purchase.
I did a little write up what the norms mean a while ago I'll just paste it here.
1. fullsynthetic for air cooled engines
2. fullfills the folowing norms API TC, JASO FC/FD, ISO L-EGD
Then it's ok for me. The above norms dictate
Specification after ISO-L-Norm (European norm)
Class => engine Performance
ISO-L-EGB (Global GB) => middle(= JASO FB)
ISO-L-EGC (Global GC) => middle and smokeless (= JASO FC)
ISO-L-EGD (Global GD) => high performance and smokeless (> JASO FD)
Specification after API-Norm (US norm)
Class => engine Performance
API-TA (TSC-1) => Mopeds
API-TB (TSC-2) => Motorscooters and Motorcycles
API-TC (TSC-3) => high performance engines
API-TD (TSC-4) => Outboardengines equivalent to NMMA TC-WII
Specification after JASO-Norm (Japanese norm)
Class => engine Performance
JASO (M345) FA => low
JASO (M345) FB => middle
JASO (M345) FC => middle and smokeless
JASO (M345) FD => high performance and smokeless
Translated by me from the german wikipedia page. http://de.wikipedia.org/wiki/Schmieröl
Stihl HP Ultra does NOT fullfill the top norms!
Good post and certainly a little info there for the uninformed. l normally agree with 7 on most things and value his posting on AS but on this issue l am sorry l disagree and do NOT believe expensive 100% synthetic offers 'better' engine protection at all period. A semi synthetic blend however will kinda give you the best of both worlds. My view is exactly that....my view and l accept that builders who have modified saws for me ie. Brad S & M/Mind do not share my view and l am completely ok with that. lf we all thought the same and had the same opinions forums like this would be far less interesting.
There never has ever been any scientific valid comparison between 2 stroke oil types that I am aware of. There have been many research projects, often privately funded, which often propogate the supiriority of full synthetic, but never at a truely scientific level. Which one is better? I don't know.
But in comparison in the 4 stroke engine world, full synthetic is clearly the winner. So there might be some validity behind it.
Is there a bad oil? I don't believe so. I see the majority of problems rated due to 1. old mix , 2. wrong carb settings and 3. no oil at all.
Often cost is mentioned and one of the deal breakers if one looks at the major brands and their products! But that is for me when the norms become interesting. I buy "no name" oil. Just the own brand of a motorcycle store. They are a very big chain of stores so they obviously can afford their own oil lines in 2 stroke and 4 stroke! So is the oil there good yes or no? That is when the norms become attractive again. I pay for 4 litres, on twice yearly sale, of their fullsynthetic JASO FD, ATI TC, ISO-L-EDG oil almost the same as for 1 litre Stihl HP Ultra! So am I buying a bad oil? I don't believe so.
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