Anyone using the original Honda GN4 on a Bird, thanks.
In Aus one of the better options (and most cosy effective) is PENRITE MC-4 SEMI SYNTHETIC 10W-50. Often on special at Supercheap or Autobarn. Been using it for 40K kms and it works really well with the bird ... smooth great changes and quiet engine.
Thanks, the one I have is mineral 10/30W, I hope this is ok for my Bird ..?!
..... just googled GN4 for info and found Honda recommends their HP4 10w30 for big bikes like the CR1100XX and 1000 etc. I couldn't find where the API/Jasco specs were but I suspect the GN4 is a lower rating for less powerful engines. Very odd that Honda spec 10w30 for these oil change kits...... maybe they are for the US market where they have very cold conditions (a snow season) and need a fast flowing thin viscosity oil to help the motor perform .
Well, strike me pink ....... I was all set to slap you around the gills with pics of my 2005 owners manual oil viscosity charts LOL , but at the last minute I opened up your 3.1Mb full copy of your 06 owners manual, and bugger me, it has been updated since 2005.......... .
So 10w30 with additives is the go for your climate.
I can see where the confusion comes from. My MY05 viscosity chart has 10w30 suitable for -10c to 30c temps, and 10w40 suited to -5c to 40c temps, whereas your 06 OM has either viscosity suitable for -10c to approx 45c.
Rapid improvement in oil formulations must be the reason the factory changed the chart in the manual. My 05 probably was based on data from years earlier, so Honda must have updated their chart for the MY06.
So you are right, though most of us were only concerned with temperature range viscosity limits, especially the SoCal guys who live in very hot and dry climates.
Here's my 05 OM oilchart just for a laugh....... but keep in mind we get hot up here in Pineapple land..... approx temp range -5c to 45c, yet we ride South to Victoria/Tasmania or North to Cairns or West to Alice Springs so we need an oil viscosity that covers -10 to 50c. You Southerner's wouldn't need the high temp viscosities as much, because you have plenty of great bike roads closer to home .
HP4 was the recommended oil on the Google search, but your GN4 should be ok for a limited period like you mentioned. The difference is HP4 has synthetic additives and GN4 is mineral.
Thanks for the info....... and as added insurance, the " 99-02 Workshop manual" available for download in the resources section of the forum lists GN4 as the oil to use (ignoring the 10w40 spec from 1999 data)....... see last pic