I use Amsoil in my race car and Brad Penn in my street/strip car. I also use Brad Penn in my John Deere machinery and have never had a problem.
My street/strip car is a '68 Camaro with an old school 350-GM iron heads, small flat tappet solid lifter cam, cast flat tops. It's been in the car since 1986, won 7 track championships at Suffolk Dragway in VA and has several thousand passes on it. No leaks and no metal in the filter when changed.
Something interesting about Brad Penn products-lots of alcohol funny car teams use their products as the oil seems to resist the 'milking' factor that is sometimes found with oils used in alcohol burning engines.
A longtime friend with a machine shop that builds race engines put a customer's engine on his dyno-alcohol burning N/A with the customer supplied Castrol oil. After warmup the first pull was lazy and got worse-suspected a pushrod problem. Took the valve cover off and what looked like pancake batter spilled out onto the floor.
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