In my owners man. it says to use 5W-30...I is hella hot here, being around or over 100 the past few weeks. I am going to sea-foam my oil today, and change it, i want to use 10W-40, will this do any harm since i am making quite a change from what the manual says....

Thanks,

Matt

 

Stick with what the manual says. It's been real hot off and on over here in NJ and I just use 10W-30 during the summer and 5w-30 during the winter. I think 10w-40 would be too thick for the honda.

 

k thanks