Quote:
Originally Posted by DavidZ
I've never bothered with a UOA for my car because I'm the original owner, car has only 12k miles, always warmed up properly and it was my understanding that I have the newer bearings that do not contain any lead. Anyways, I finally got a UOA with TBN because the car is so rarely driven (in fact the CBS has yet to call for even the first oil change), I've been doing oil changes only once per year (always Castrol 10W/60). My most recent oil change was after 18 months and only 500 miles, so I wanted to see if I could go even longer between changes. I might bump it up to 2 years between changes now...
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I wouldn't recommend using the same oil for more than a year unless the manufacturer specifies it can be used for longer interval.