My understanding is that your car gets a little "drifty". A lot of things can cause that though. Some have said that if you have over 100K on your car, you need to change it. I've also heard of dramatic improvement in handling. I changed mine last year -- could tell absolutely no difference. What the heck though, it was only 30-40 bucks and it gave me an excuse to get my hands dirty.

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Ken Fuller
1990 300E