I'm not trying to start a synthetic vs other oil deal just a question. In my opinion whether you use one or the other, oil changes are necessary every 3 months or 3,000 miles. However, I'm standing in a store today and overheard a couple talking. They were trying to find some oil for their friend. They said that it wasn't here, because the $5 bottle wasn't the correct brand. It usually runs around $17 per bottle, and he used 10w-50. Then stupid me opens my mouth. I mentioned that I knew where they could get the $17 per quart but asked if they were sure that is what they needed. The gentleman who they were purchasing it for popped up and said yes, it is necessary. Its for his $60,000 jaguar. Okay, my mouth opened again LOL I'm not above anyone having a $60,000 anything, but I couldn't help but stifle a laugh. The kindest thing I could say at his arrogance was: 'why are you putting 50 weight in a $60,000 jag?' He didn't answer me, just pointed out that he knows about oil, etc. I just nodded and began minding my own business again, as I should have to begin with. I guess my questions are :why would anyone put 10w-50 in their car, $60,000 or $600, during the winter months? The only time I've used 50w in anything was when my rings were worn and I couldn't afford to rebuild. Second, as long as an oil is certified and the correct weight/forumula for your vehicle what difference does it make whether or not its synthetic or 'regular' oil? Kay

Once in a blue moon, the steering on my 1994 Mercury Sable gets 'stuck' in the middle of a turn. Am I correct in assuming that my rack is on it's way out? Plus, assuming that my tires are balanced, (I had them checked and they are), and my alignment is okay, would a bad rack cause slight shimmying at high speeds?