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If you are going to run regular oil for a bit longer , short changes can help clean .
If you really want to clean it out before switching get some Ol Schlamm Spulung from Liqui-moly, Put a can in and run 160 miles then change oil and that stuff really cleans them out( much better than the Amsoil flush , or the K&W or Gunk)
You can order that stuff from Roy Rogers import auto (1800 374 2318 )if you cant find it locally
You can order Amsoil online from www.amsoil.com (Please use customer #502155, )and have it shipped to your house.
What I normally do on high milage engines is Run the flush , drain it , fill it with new cheap wal mart oil and a new filter, run it around for a bit to absorb any remaining flush residue , then drain it and install the Amsoil and filter and then it;s good to go for about 35,000 miles ( on the 0w30 ) change the filet about every 12,500 miles , On a high milage engine sometimes they need to have the first filter change around 6000 miles if it starts looking a bit nasty
Definately a good idea to switch the tranny to synthetic. Best to do a power flush
( instructions in the 700/900 faq's) to change it all out otherwise you only change about half your fluid
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