400EX oil
 

What is the oil weight that is recommended by Honda for the 400EX?

Sorry I don't have an owners manual.

Thanks,

Tom

10w30 or 10w40 from -10 below on up any colder 5w30.this is for 07 400ex but their all the same.i run 20w50 in summer 10w40 in winter a lot of people run different weights.

10W40 makes a good summer oil in most of the country. For mild weather, 10W30.

For very cold winter weather 5W30, and if you ride in extreme heat then 15W50.

I highly recommend an ester synthetic oil, like Maxima Extra!

What part of the country you in????

I'm in southern Arizona (Sierra Vista).

I'd run thicker oil in your climate. 15w50 Mobil One, probably.

I use Mobil 1 in every car, ATV, dirt bike, street bike, and drag car I have or had. It's excellent stuff. I have not found anything better.

I too am in the hot southwest, but I don't ride during the heat of midday. Plus, we mostly ride the mountains anyway, where it is cooler than the valleys....so I run Redline 10W40.

If you do ride in the heat of the day, I would run Maxima Extra 15W50.

I don't anticipate riding in the scorching heat too often, I'll go with 10W40.

400ex oil use
 

Whatever u do MAKE SURE u dont use car oil! Obviously

Welcome to the forums Jason.
This thread is 3 years old.
I'm sure the 400 is still running good on car oil...LOL
And the difference would be?