Why synthetic oil weeps

No shit, Sherlock

Oh yeah?

And what about the bikes that have cats?

"A little learning is a dangerous thing"

 

You really should be more selective in what you bite on.

Absolutely right. Never owned one myself, but times and oils do change.

http://www.ibmwr.org/otech/oilreport.html

 

Trolled. And at my age, too....

Blimey. Interesting, that. Not sure if it's useful, but certainly
interesting.

Bugger all about (specific) motorcycle oil additives damaging cats,
though. Interesting to see the bit about phosphorous levels, although
that substance is present in both car and bike oils.

 

Sorry. I didn't know it was loaded. Honest !!

Organic zinc compounds are used as extreme pressure, anti-wear
additives, and are therefore found in larger amounts in oils
specifically
blended for high-revving, turbocharged or racing applications. The zinc
in your oil comes into play only when there is actual metal-to-metal
contact within your engine, which should never occur under normal
operating conditions. However, if you race your bike, or occasionally
play tag with the redline on the tach, the zinc is your last line of
defense.
Under extreme conditions, the zinc compounds react with the metal
to prevent scuffing, particularly between cylinder bores and piston
rings.

[snip]

As we mentioned, organic zinc compounds are already found in
virtually every major brand of oil, both automotive and motorcycle.
However, in recent years the oil companies voluntarily reduced the
amount of zinc content in most of their products after research
indicated the zinc was responsible for premature deterioration and
damage to catalytic converters. Obviously this situation would not
affect 99 percent of all the motorcycles on the road -- however, it
could have been a factor with the newer BMW converter-equipped bikes.

http://www.offroaders.com/tech/snake-oil.htm#four

 

Not only that but zinc is "consumed" under those conditions. More zinc
does not protect from higher pressures/forces, it only protects more
times when the metal-to-metal condition occurs. With short oil changes
the amount of zinc doesn't make much difference just so long as there is
some zinc to start with.