I used to own, and very dearly miss a 1995 Mazda 626 5-spd I4. I had Jiffy Lube do the Bilstein flush for $75 or something when the car had 240,000 miles. Lifter noise quieted a bit (most of it was caused by an oil pump design flaw) and it reved smoother and drove nicer overall.
That car didnt burn any oil (it did have an oil leak), drove perfectly, got 35mpg, looked perfect, and had not one flaw. Except I wanted a luxury car so these days I have an Infiniti Q45. :P
I recommend the flush.