07-12-2023, 04:41 AM
(07-12-2023, 12:39 AM)m in sc_imp Wrote: so who's doing a flat tappet cam conversion here to necessitate this much zinc to be needed in a CB1100 motor? lol. also remember that when any of this gets into the combustion chamber, and some always does, it creates actual ash, which isn't a real good idea to be running thru the motor.
Honda's own GN4 10w40 had 1200 ppm of zinc as recently as 2007. Did all the pre 2007 bikes have flat tappet cams?!
Rotella T6 5w40, a forum favorite for colder climates, has long had over 1100 ppm.
I was surprised to learn that Mobil 1 4T is 1800 ppm, but no one is complaining about Mobil 1 4T necesitating a cam conversion!
I can understand wanting to protect the catalytic converter, but the cam conversion claim is over the top!
Current GN4 numbers are just under 900. T5 is just over 1100. It's within 300 ppm, and the T5 is conservative compared to Mobil 1 4T.
If the zinc numbers were as critical as you're claiming, Honda would have specified that in the owners manual.
Honda recommends a 10w30 oil that meets the JASO MA2 spec.
That's exactly what Rotella T5 10w30 is.