I made the change from -10AN to -12AN on my SPF several years ago. I had spun a rod bearing (lost
oil pressure due to broken pump drive shaft) and while the motor was out I decided to upgrade to -12AN rather than just replace the cooler components due to any possible debris.
I bought a -12AN cooler from Olthoff Racing that fit the SPF with only little modification. Upsized all the fittings and lines using as few elbows as possible, and I am using an
oil cooler manual bypass to reduce the flow to the cooler in normal driving to help keep the
oil temps up.
It works very well, but I probably wouldn't have made the change if it wasn't necessary for me to change the cooler due to my motor failure. The larger lines are definitely more noticeable from the outside (a plus if you want the attention), and take up valuable space in the engine compartment (a big minus you may have not considered).
This photo is with the -10AN lines and my "original" oil cooler temperature control :-)
And this photo shows the larger capacity cooler with -12AN lines. And hey, look!!! No salt :-)
Hope this helps,
Jim Kellogg