Originally Posted by tverhein
Dr Jay & Willwren:
Ok, I have listened to the posts here.
So if I continue to burn 87 in my SSEi, I run a risk of damaging components, which in turn could damage the engine if the components are not replaced. I am a pretty 'soft, steady, driver', driving 70 highway miles daily. So what is the probability I will damage components? Is it 25%, 50%, 75% some component will go bad? How quickly will a component go bad? Also, which component would likely to fail first?
Mmm...I think I was confusing again
Try this another way....If your knock sensor is working properly you can run 87 octane all day without damaging your engine. If your knock sensor is not working you run a risk of damaging your engine.
As for the percentages, there are a lot of variables involved in it. If the knock sensor is already picking up say 15* of false (or real due to some other issue) knock and you get another 10* of 'real' knock, you may be in for some trouble. On the other hand if your knock sensor is working properly and not picking up any false knock there'* about a 0% chance you'll damage your engine by just using lower octane. The knock sensor is the key here.
I've known people who really abused their car and had extremely high miles on it without ever replacing their knock sensor and I have yet to hear of anyone suffering engine damage due to low octane. (longest sentence award?) That doesn't mean it hasen't happened though.
Many people here remember a long debate (fist fight) we had over this very issue. Somehow it seems most of the information has been fuzzied up or totally lost.