Quote Originally Posted by aaronng View Post
Honda recommended oil viscosities are 0w-20, 0w-30, 5w-30, 10w-30, 0w-40, 5w-40, 10w-40 and maybe 15w-40. Says so in the manual.
Indeed they are, but for the temperature range we are generally going to experience in south east Australia 10W-30 and 10W-40 are recommended. The DC5R manual suggests that no thinner oil than 5W-30 be used and that is for temperatures down to less than -20 Celsius. I see no mention of 0W-30 or 0W-20 in the DC5R manual .

Quote Originally Posted by Chi View Post
A lot of Japanese Honda tuner shops use 0w-40 for track.

I've used mainly 5-30 and 10-40 and wondering if it is any beneficial for the 0w-40.

Just a question, doesn't mean I'm 100% using it.

I know J's racing use 0w-20 for their track cars. which is a bit odd.
J's possibly build their motors with different clearances and ideas to stock motors or they run them at different temperatures. I have no idea and I am certainly not going to disagree.

Honestly very few people, myself included, choose their oil using any logic or evidence. I would not honestly recommend Red Line to anyone else, I would only say that I have been to many track days on the oil in a variety of temperatures and my car still runs well.

I am still interested in why you want a lower viscosity (eg 0W or 5W) at low temperatures?