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  1. R

    How many years can I leave synthetic in before a change is necessary?

    Hi guys, its been a long time since I've been on the board, but I'm reminded of how much I enjoy it while searching for posts on my question. I have Mobil 1 0W40 in a '91 Toyota MR2 Turbo. The oil has been in for more than a year, but I've only driven 800 miles on the oil. I read here some...
  2. R

    Oil to free sticky rings, clean varnish?

    My wife's Saturn SL2 needs some help desperately. Its using about a quart every 2000 miles, no external leaks. It's already had a failure of the timing chain tensioner which was caused by poor oiling according to the dealer. My wife says she neglected the oil badly a few times early on. Now the...
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