Honda GN4 oil is recommended by Honda, but for the CBR300R (as well as the CBR250R) the recommended viscosity is 10W-30 (or GN4 10W-40 can be used if your Honda dealer is out of stock on the GN4 in 10W-30).What sort of oil should I put inside my cbr300r?
I cant really understand the jargon inside the manual.
GN4 20W50 Oil the correct oil?
massive thanks for the detailed explanation - I'm trying to increase my knowledge of the bike and how to maintain it. I feel like my safety depends on my machine operating correctly, and being completely ignorant of the mechanics is quite unwise.Honda GN4 oil is recommended by Honda, but for the CBR300R (as well as the CBR250R) the recommended viscosity is 10W-30 (or GN4 10W-40 can be used if your Honda dealer is out of stock on the GN4 in 10W-30).
The GN4 20W-50 is intended for use in the older air cooled singles (like the XR & XL models).
You can also use other brands of 10W-30 or 10W-40 oil, as long as it is a motor oil specifically designed for motorcycles with wet clutches. You do not want to use motor oils made for cars, as they typically contain additives that can cause clutch slippage if used in a motorcycle application. Also, motorcycle specific engine oils contain additive packages designed for the transmission, whereas motor oils for cars don't.
massive thanks for the detailed explanation - I'm trying to increase my knowledge of the bike and how to maintain it. I feel like my safety depends on my machine operating correctly, and being completely ignorant of the mechanics is quite unwise.
just checked my local shop, they have honda GN4 10w-30 oil - I'll probably pick that up tomorrow and give the cbr a top up.
do you know the difference between HP4 and GN4?
Honda HP4 is a synthetic oil. I'd recommend not switching to a synthetic until you have at least several thousand miles on the bike. Mineral oils (aka petroleum based oil) like GN4 are generally better suited to new engine break in than a synthetic oil, the reason being that synthetics don't allow the engine & transmission internal moving parts to wear together as well as what a mineral oil will. This is evidenced by the very fine metallic particles you see suspended in the drained oil at the 600 mile oil change, which is normal and indicates that the internal moving parts are wearing in together. Honda fills the engines at the factory with same GN4 you buy from Honda dealers as their so called "break in" oil for this reason. I myself used the GN4 mineral oil at the 600 mile service/oil change, and then switched to a full synthetic oil (Valvoline 4T Synthetic 10W-40 Motorcycle Oil) at the 4000 mile oil change. IMO, the biggest benefit to using a full synthetic oil is that the gearbox seems to be a little smoother shifting. But that perceived "improved smoother shifting" could also be due to just getting more miles on the bike... my CBR250R now has about 15,000 miles on the odometer. I think the whole mineral vs. synthetic debate really comes down to personal preference. There is that old but true saying: The best oil is clean oil. With that in mind, and regardless whether one uses mineral or synthetic in these bikes, I would not go more than 5000 miles between oil & filter changes.
I should mention another thing you'll need to be aware of when you're checking the engine oil level: That the bike is on a level surface and is held upright off of the side stand, so as to get an accurate reading in the sight glass. If the oil level is in between the two marks next to the glass, the oil level is correct. Too many new owners look at the sight glass with the bike resting on the side stand, and not seeing any oil in the glass think that the engine is low on oil. Then they end up overfilling the crankcase, which is not a good thing.
Has the first service been done? If it hasn't, I wouldn't use HP4 to add to the mineral oil that is in the engine now. Save the HP4 synthetic until the second oil change at 6000 or 7000 km, when the engine will be fully broken in.got the HP4 10w-30 from the shops today, gonna give the bike a top up!
I think the 5W-40 is, but not the 10W-30. I have a quart in the garage, I'll double check later.At the first oil change I go to Rotella T6. It's full synthetic and inexpensive. It's sold as a diesel oil but meets the JASO MA standard and many people run it in their motorcycles. $23 a gallon at Walmart, less when Shell offers a $5 rebate.