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Stock or mild builds with flat tappet cams like at least 1200 ppm zinc. Major builds more, due to stronger valve springs etc.

I run 5W40 Shell Rotella T full synthetic which has close to 1400 ppm zinc. Most, if not all, heavy duty (diesel) motor oils have a good amount of zinc. Racing oils too, but may not be suitable for every day cruising. www.bobistheoilguy.com has tons of info.


I read on Bob Is The Oil Guy's web site a used oil analysis stating that the new CJ4 Shell Rotella T (SRT) 5W40 full synthetic at about 1380 ppm zinc. Last night I emailed Shell's tech, who responded back that their newest CJ4 SRT 5W40 has 1200 ppm zinc.

2010 Black Challenger SE <> 3.5 V6
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