Thunder Mfg. has tested several different oils and additives over the years. Redline is the only one we feel confident in recommending to our customers. Every product that Redline produces is of the highest quality and performs as claimed. We run all Redline fluids and additives in our personal vehicles also, and have added their Diesel oil and additives. If you don't see a product you are looking for let us know and we can get it for you.