My 2005 X with 22k miles looks like it will need it's 4th turbo. The variable vanes keep getting stuck and along with low boost the check engine light comes on. Last month the Ford dealer took the turbo apart, cleaned it and reassembled. Everything work fine until a few days ago. I accelerated after stopping from a red light and the turbo didn't whistle as loud as it should. The check engine light came on. What the heck is going on here? When I do drive the truck I will get on it meaning I don't drive like a grandma. The truck stays in a semi-conditioned garage at night. I drive it at least once a week for about 60 miles (30 miles to work and 30 back) and at least 4 times a year to NY which adds 700 miles to the odometer. We also use it for our bi monthly visit to WalMart (about 60 miles round trip) to stock up on supplies (4 kids eat A LOT!) Am I not driving the truck enough or is there something wrong with the turbo? Could the HPOP be the problem by not providing enough oil to the turbo? Oil is changed every 5k miles and at 20k miles I went to Rotella synthetic. Will the CCV mod help in that it won't allow oil into the turbo thus preventing coking on the variable vanes? How do you stop the variable vanes from rusting? The mechanic told me he put antiseize on the variable vanes to prevent rust. The only mods are Walker BTM muffler, Accufab elbow and 07 finned diff cover. I use diesel kleen (gray bottle in summer, white in winter) with every fillup. I have never used a computer programmer of any kind. Any suggestions?