I find that turbo's REALLY help... It might be the turbolag, but from a standstill up a hill.. my car goes slow as hell. 5th gear going 80 km/h she can tow up a nice hill. I'd definitely recommend looking into a turbo'd unit, as well as intercooling
On the highway going 120 (your equivalent to 75 mph... ) the car cannot be stopped. (unless theres some old guy driving nice and slow) I even find 100km/h (60mph) to be fairly reliable, but on an incline, i prefer at least 110 (i think thats 68-69 mph). I also use cetane booster from Power Systems (white bottle, some purple on it, that i got from flying J's) and that helps too.
When the turbo is hot and spooled up, you really notice the power difference. Takes me about 5 minutes of driving before she warms up. I took it to the cottage in the summer and even with all the hills and bends, it drove so smoothly through the hills.
Well I hope my experience helps a bit
I hear grease is awesome... everyone driving around you will get hungry! Especially on the highway haha! no more black smoke either... just white
So don't confuse it with your rad fluid.