Changing to syn oil in high milage motor

I've just picked up an '06 Taco 4cyl 4x4 with 104K on the clock. I've heard the choice to go with synthetic oil should be done early on, not in a motor well past break-in. Any truth to that?

 

I switched over to synthetic on my 2004 at a little over 200,000 on the odometer. It's at almost 250,000 now with no negative impact.

 

I had 180,000 on my Jeep To when I switched over. Had 220,000 when I sold it. I had the same question back then and everyone I talked to about it (that switched) had no issues.
Oh BTW , that baby is just getting broke in at 100,000

 

If you want to change to synthetic, go for it. I didn't change mine over until 40k miles. You can alternate from synthetic to dino every other oil change if you really want, it's not going to hurt your engine.