Dear Lucas I would like to thank you for bringing a lil Geo 4-banger engine to life. I have been using synthetic oil in my car since I bought it new in 1991. I have used many synthetic oils in my car,Amsoil from Castrol, but until one day I was shopping in Pepboys and I found a synthetic motor oil that said Lucas synthetic 10w-30 motor oil,and I said to my self, ahh, why not try it. So I get home, change my filter, filled the engine with Lucas, closed the hood, and then I started it up. I noticed that the engine was running smoother and quiter, so I decited to give this Lucas motor oil a run for its money to see if it really works, and it did. The engine ran 20 degrese cooler, and had more Get-up and Go power. It was amazing that motor oil could do that. Since I found out Lucas really worked, now my engine and tranns is fully ran by Lucas. So thank you Lucas, your products are well worth the money.