They have a great fuel additive , and a nice motor oil additive for diesel oil.
Had a v8 chevy 6liter fuel injected gas with 300,k used it in motor,fuel and auto trans.
Nad a 70 hp ford diesel tractor 1978 model used in same as above.
Use it in my diesel, fuel additive for winter we get -35f in winter here, not this year though.
I like it and I will us it in a defender with out a doubt