TamZ, your car will go into limp mode at 280 I believe it is, it will not simply break down. It will just not let you rev your engine past a certain point (3,500rpm I think?). If the oil continues to rise in temp, there is a second limp mode which is even more restrictive. Either one will allow you to continue to drive it. However, I'd be freaked out if my car went into limp mode, but that mode is there for the purpose of making sure you don't break down.
You can get an oil analysis done by Blackstone Labs. I believe it is $22 to do so. They ship you a kit for free, you collect a sample of the oil when you change it out and ship it back. You pay them to have the analysis done, and then give you a sheet with numbers that will mean nothing to you. They also include comments, like "hey, your oil has been sheared and has no viscosity left, likely due to extreme temps!"...or "stop worrying, your oil could have gone another 3,000 miles!"
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