Lucas makes a great racing oil and they do recommend their additive to it also.
I have ran Lucas in everything for decades. Never blown anything up.
That said, I now consider Shaeffers to be the best oil on earth.
And will run it plain.
Why is it the best ?
They are getting 1,000,000+ miles out of gas and diesel engines and they still run great on tear down.
And, people are getting 5-7 more horsepower just running that oil on dyno tests vs the same weight Mobil 1.
Pretty much means they are the best.
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