for which company this ID [e-mail]?

Answer 1

I hope this is helpful to you:

ROYAL PURPLE XPR

XPR - Extreme Performance and Racing oils are a family of oils formulated for use both on the strip and the street. XPR produces winning results on the race track and is safe enough to use in your daily commuter car.

XPR’s high film strength make it exceptionally well-suited for today’s high performance cars, particularly turbo and supercharged engines and / or engines using a nitrous boost. Professional engine builders and race teams have cited increased horsepower and longer engine life with the use of Royal Purple

Answer 2

See my answer on the same question as this that you asked.