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ME612- I think you will be fine with valvoline oil.. either regular or synthetic. I have never used Valvoline but they are a good brand. And as JET said, the valvoline doesnt lifter tick as much.
Personally I have used Castrol Syntec in my car ever since the rebuild. Its great for lifter tick ( I get none). I switched to Mobile for one oil change and ever since that one of my turbo's copper washers has been leaking a little and I noticed the oil pan leaked a little too. I know Mobile one is great oil, but in my car it lifter ticked ALOT when cold and liked to penetrate a little too much for me, so I switched back.
Higher mileage motors- I wouldnt switch to synthetic.. not worth it and it will penetrate through gaskets and other things that were mentioned before.
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