07-12-2023, 08:16 AM
(07-12-2023, 06:06 AM)m in sc_imp Wrote: i'm just trying to figure out why YOU think its so important to have so much zinc in there. 2007 was 16 years ago, they changed it for a reason since then. its bad for 02 sensors over time, period. some reports claim 50% reduction in life of an 02 sensor. You don't need to justify to anyone why you want to run it in your bike, do whatever you want. But, there are downsides to it as well, which doesn't seem to be a concern to some. But, it bears mentioning.
The local shop here which services mostly high end dirtbikes, and a lot race, got so tired of his customers droning on and on about running rotella, he started carrying it just to give them what they wanted if they requested it. high strung 4 stroke motocross singles. zero benefit over anything else. He doesn't care if you bring in your own oil, really. so its not a selling expensive oil thing. I've seen the results 1st hand. It doesn't do anything better except maybe cost a little less, and obviously thats the main driver here and with mos tpeople. . The BIGGEST thing is to change the oil regularly.
To quote Blackstone Labs "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. (hence the flat tappet comment) 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. However - and this is the important part to remember available research shows that more zinc does not give you more protection, it merely prolongs the protection if the rate of metal-to-metal contact is abnormally high or extended."
so.. why again is it needed in the CB motor at 1000 ppm+?
Did I say that the CB1100 needed a high level of zinc? Nope.
I said that there are plenty of other well respected motorcycle oils with comparable or higher zinc levels (M14T).
Neither Honda, the industry at large, nor you seem to be going after those other oils for damaging 02 sensors or catalytic converters.
Originally you took exception to the fact that it didnt say JASO MA2 on the bottle. Now it has those letters. Then you took exception because I didnt want to buy 5 quarts of oil if I only need 3.8.
Now you're trying to take exception with zinc levels.
The current API spec lowering zinc below 1000 for gasoline engines with catalytic converters didnt take effect until 2020, three years after Honda stopped selling the CB1100 in North America.
Rotella T5 10W30 (and T4 15w50 and T6 5w40) all have a comparable amount of zinc as most other commonly used JASO MA2 motorcycle oils available today.
Honda recommends 10W30 oil that meets the JASO MA spec.
Rotella T5 10w30 is one such oil.