I did mean i would NOT, sorry, guess i let one get past me. Again not so say you cant, just personal preferance, i have no facts at all to back my statement.

 

Wait a minute! TK, you said you are running 10W 40. My HP4S is 10W 30. What is the stock recomendation for the bike?

 

Factory recomendation is 10-40

 

^+1

also(i am told that) the temps that these bikes run at(180-230) is high enough that it does not matter if it is 30 degrees outside or 120. Once the bike is fully warm the oil is going to run at its own temperature regardless of the surrounding conditions as long as your cooling system is working properly. The oil is always going to be approx the same viscosity within the motor regardless of the outside temperature, using thicker oil CAN (im not saying it will) cause damage, because at 11000 rpm it creates excessive resistance on the internal parts of the motor, creating unnecessary stress, that the recommended oil would not. Its like moving your hand through a tub of water and then moving your hand through a tub of oil, the oil is thicker and will provide much more resistance, does the same to the motor.

That is how it was explained to me by an experienced tech because i asked him if i should run thinner oil in my truck in the winter. His answer is no.

Just wanted to throw that out there, not intended to create argument, just a possible explanation for the factory specs.

 

 

Repsol has been very good to Honda

Fun-Syn 10-40 every 2-3k miles.

 

SOOOO, am I the only guy running 10W 30? I haven't run it in this new motor yet. Should I drain this stuff and get a full syn 10/40?

 

YES!!!!!!!!! if you read my previous post. Thicker=bad. Thinner=even worse!!