motor oil

[trx400 rider]

what weight motor oil should i put in my trx400 and does it take gear oil what type weight gear oil should i put in it

[NacsMXer]

It does not take gear oil. You can use (certain) automotive oils, but just stick with motorcycle oil to be safe ;)

But the standard viscosity the motor calls for is 10w40.

[elmer91]

for motor oil i always use rottela.

[miller821]

Agreed with the Rotella statement, it is a great oil...

For weights, if I run Mobil oil I run 20w-50 in the summer, and 10w-40 in winter.

i just use honda synthetic

[ae13291]

i dont understand why people are running the 20w50 and adding more pressure on there oil pumps. i run 10w40 act evo castral oil

[chayes627]

there is minimal stress added to these oil pumps with that weigh oil. you will never have these oil pumps go up on you cause of 20w-50 weigh, not to mention it says in the owners manual that you can use 20w-50, but the little bit of added stress and higher oil pressure is well worth the added protection of the heavier weight oil

[buck440]

you tell him

[coryatver]

I wouldn't run anything other than 20w-50 synthetic in the 400ex and change it often.

[miller821]

Originally posted by ae13291
i dont understand why people are running the 20w50 and adding more pressure on there oil pumps. i run 10w40 act evo castral oil

20w-50 is recommended for summer/hot weather riding... I'm sure 10w-40 works just as well, but why take the chance of it thinning out too much?

[rodeo#11]

ive been running 20w-50 in my quad since the first day i got it 3 years ago and ive yet to have any over heating problems or anything. works great for me and i have noticed any difference in the oil pump to be honest.