I have read compelling info running these quality 50w oils have some bad UOA coming back. Good thread on it over at svt
forum from an Amzoil guru. The short story is the Motorcraft 50w shears quickly and most guys that road race are using Amsoil 40 or 30 weight. The red line 50 does not shear quickly and has higher than normal iron levels in the uoa. Like I said there is a very comprehensive thread on svt.
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