ATF makes more HP , but do we need it ?

Kaw4me

Member
Feb 15, 2010
113
5
This forum like many others is peltered with so many opinions
on tranny oils it's mind boggling.

Just my opinion but here goes ---- ATF helps drastically when
your riding a small displacement bike " 125 or less ? " and you
want maximum HP to the rear wheel.
Thats where it all started , was on the track.
You'll loose 2-3 HP with too heavy an oil.
Racers didn't care really how it shifted , just as long as it did.
The viscosity of ATF vs. 10w40 is huge , ATF is like a 3-4 wt.

For us average trail riders , run what shifts the best and you'll be
fine . More than likely it will be some sort of motor oil.
 

BSWIFT

Sponsoring Member
N. Texas SP
LIFETIME SPONSOR
Nov 25, 1999
7,926
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I've been running ATF in my YZ for years, ran it in my KX before that. Zero problems.
 

EYY

Member
May 22, 2010
159
1
I prefer using engine oil over ATF, purely due to the better cushioning provided by the thicker oil. Clutch drag and easy shifting are some of the main reasons Kdx riders change to ATF, although this is often a temporary fix for a notched/worn clutch basket.
 

Kaw4me

Member
Feb 15, 2010
113
5
Just to clearify multi-viscosity oil ratings.
This is how any oil company rates a 10w40 for example.

At zero degree's it has the " properties" of a 10 weight oil
and at 200 degree's it has the " properties" of a 40 wt.

Multi- viscosity oils are all a compromise as a straight 10w
will out flow a 10w40 at cold temps and a straight 40 will
be much heavier at high temps than a 10w40.

Sorry to over think this subject. :bang:
Run what shifts the best !
 

Kaw4me

Member
Feb 15, 2010
113
5
EYY said:
I prefer using engine oil over ATF, purely due to the better cushioning provided by the thicker oil. Clutch drag and easy shifting are some of the main reasons Kdx riders change to ATF, although this is often a temporary fix for a notched/worn clutch basket.


Many may laugh or disagree but I'm running Total /Elf 10w60
moto GP oil in our tranny's. 100% European synthetic and flows good when cold. The company I work for is a distributor so I can get for a great price. :cool:
 

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