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Hmm...can you please explain that more (why it could be *wrong* to run signature)? I do run signature in my other car that is rarely driven (maybe 1,000 miles a year). Price isn't really an issue. They're both weekend cars and only get an annual oil change.

Thanks everyone for the replies. I got just what I expected....you did not disappoint!

Nothing...I'm 99.99% sure it's a stupid question to ask, but wanted to ask nonetheless.

I'm sorry if this has been discussed - I searched and didn't come up with any solid answers. Search was bogged down with comparisons. I just purchased a car (1996 Z28 w/39k miles) that has been running on Mobil 1 for it's entire life (since 1k miles). I put Amsoil in my other vehicles. Is there...