fork oil vs motor oil

[Alf]

Hola amigos:
I´m on hollyday travel riding  my fantastic FJ 1200 in mainland Spain and Portugal. When I come back to Tenerife is time to change (again) the fork oil
I´ve used 10-40 w motor oil instead the OE recommended 10w fork oil in my CBX with optimum results, and much more cheaper!. I´m thinking to use 5-50 w fully sint motor oil in OE quantities in my FJ fronk fork, thinner that the 10-40 w on
What do you think?. The 5-50 oil is Mobil 1
Regards

[rktmanfj]

Alf, is your fork completely stock?

Randy T
Indy

[Scooterbob]

Here is a quick discussion that I had in the past.  Hopefully it will help.

http://www.fjowners.com/index.php?topic=1910.0

[Arnie]

If you're going to change to an alternative to the fork oil, at least use a hydraulic oil that is high detergent and intended for this kind of use.  ie; ATF

Be aware that there are 3 different viscosities of ATF.
Choose the one you want. 

Chrysler ATF+3 = 10W

Dextron 3/Mercon = 15W

Type F = 20W

Any of these would be a better choice than motor oil.

Arnie

[Alf]

thanks for the link. I supposed that there was anything about but I didn´t find it  

My fork is fitted with hagon springs and usually with 10w in OE quantities. But I´ve thinking about fill the fork with 5-50w because the 10-40 w works fine in my Honda, the Yamaha FJ 1100 mannual recommend 10-30 motor oil and ´cause now MOTREX sells an expensive 10-30 fork oil saying the excellences of the multigrade fork oil, (I think they have discovered the motor oil again)