I understand that the fk8 is the same engine basically as the fk2. I run an fk2 and in 2015 Castrol and Honda developed an oil specific for the fk2 and Is Castrol edge professional h.The h standing for Honda. For the type r Ow-20 is specified. And is extremely quick to get round the k20C1 engine. This is very important as most engine wear occurs on start up. I've read recently that Honda type 2 oil is made by Mobil. But that's what It said. Only the dealers will know as it comes in barrels. As said above why a dealer put 0-W30 is beyond me. Castrol edge professional h is an extremely well fully synthetic oil and you can see the spec online. I have read that some fk8 owners have been having fuel in the oil in the crankcase,so some owners are considering 0w-30 so it will accept some fuel dilution with less effect than it was if it was 0w-20. I think Owners of Both the fk2 and fk8 need to understand causes of fuel in the oil. Because the k20C1 engine is a dfi turbo you need to be aware that when the engine is cold and you start the car you need to not idle on the drive for very long maybe a few minutes and set off and the engine will warm up quicker than ticking over on the drive. The coolant temperature will reach its optimum very quickly and you need to be aware that the oil takes longer to reach its optimum temperature before you use all the bhp and torque at your disposal.
Never switch your fk on, on your drive and then switch it off moments later as the engine will enter into what's called a cold start and put rich petrol into the bores and will stay there and will dilute the oil on the bores Which will find it's way eventually into the crankcase. You need to get the engine up to temperature by taking the car for a run.
Avoid long periods of idling as this is not good for the spark plug and also can cause fuel in the oil also not good for the exhaust system as condensation left uncleared from the system can cause premature wear. Also short distances are not good and are classed in the cars handbook as severe usage. The service schedule is different for severe use and things like it's very important to change the oil more often ,also the engine will not get up to temperature so lots of rich fuel around and this could cause fuel in the oil. If you smell petrol on the dipstick then a small amount shouldn't be a major problem with the oil, but if your oil on the dipstick level rises you need to keep a eye on it and if it keeps rising have a lab test or just change the oil.
most of this information what I have read and some is from my personal experience. I did have a slight ingress of petrol in my engine as I wasn't aware of just starting the engine and moving it on my drive to wash it without getting it up to temperature would leave rich fuel in the bores leading to fuel in the crankcase. since I never start my car and switch it off ,I always get the engine up to temperature with a run.I hope this helps all fk8 and fk2 owners.
Disclaimer. This article is part what I've read and part personal experience.
Regards Fred.