Stock oil for the 1kRR is 10/40 ... all 10/30 stuff is "energy conserving" and is not recommended for bikes.

 

Synthetic can dry your seals earlier I would not recommend using it. Castrol make a motorcycle oil 10/40 I used this in all my bikes for years with no problems. I ge tthe filter from the dealer.

 

I found this website today, very informative on this subject.

http://motorcycleinfo.calsci.com/Consumables.html

 

Synthetic shouldn't hurt your seals. Synthetic IS dino oil that has been refined so that all the HC chains are the correct length. This means there is less burning off and therefore less acid produced which is what eventually kills your oil. Some of the synthetics contain moly which can make your clutch slip. I've never had a problem with clutch slippage with less than 300 hp[8D]

 

pretty informative post...i think i am gonna go with the 10/40 full synthetic from amsoil

 

I've always used Honda oil. I just bought about a dozen quarts and a few filters. This works great when you have to drive an hour just to get to the dealer like I do.

 

I cant believe another oil post

dino/synth
it doesnt matter

you can put synth car oil like mobil 1 red or gold cap in your bike the day you get it home from the dealer

mobile M108 car filter is a direct replacement but some honda dealers say that it will void your warranty
i stick with K&N because i safety wire

plain honda GP4 the normal dino stuff has more moly than repsol 4t full synth

 

When is recommended to switch to full synthetic oil?

 

as soon as you get it home from the dealer
dont let anyone say you cant either because the honda manual
says that you can use HP4 and doesnt not say anything about waiting
(coincidently it doesnt say anything about rpm limits for break in either)

as long as the synth meets the oil requirements listed in your manual you are good to go
the oil cannot contain moly however, it will ruin your clutch
repsol synthetic has less moly that honda gp4 dyno oil btw

 

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