Switching to synthetic

I am about to switch to a synthetic motor oil in my 5.3L '02 with 28,000 miles on it. I've read a couple of places that when switching from a conventional oil to a synthetic one, you should use a can of motor flush in it to get all the old build up out. Is this true?

Stay away from motor flushes. The engine shouldn't be dirty at that mileage, and in a really dirty engine a flush could loosen a bunch of gunk all at once and do more harm than good.

Some people notice a cleaning effect with synthetics. If the oil seems to get dark fast, you might run a short change interval with your first batch, say 3000 or so.

What oil are you considering? The real synthetics are Mobil 1, Red Line, Royal Purple, German made Castrol 0W-30, and Amsoil. Most of the others are just highly refined dino.

Read this, it will answer a lot of your questions and a lot more.

http://www.automotiveforums.com/vbulletin/showthread.php?t=388147&highlight=oil

I think I'm gonna go with Royal Purple. I'll also be using it in my wife's civic which has 62,000 miles on it. Anything special I should do there?

And I already read most of the pertinent info in the oil bible, but thanks

I bought a used '91 sportside with 60K and a wrist pin knock. Changed to Mobil 1 and the truck never had any work done until it was totaled at 300K. No special flush, just 10K miles on oil changes.