I bougth my 2008 Tacoma 2.7L 4cyl 4X4 brand new about 9 months ago and soon after I bought it, I have been disappointed with this engine. It seems to be slugish, underpowered for a truck this heavy. it is a little too noisy with too much vibration. I tried putting in 5W-30 syntetic oil in order to make the engine run quieter and smooter, which seemed to help some, but had some trouble with valve noise and whistling at cold start ups in cold mornings (it calls out 5W-20). I took the truck to the dealership and they said they don't see any problems and everything is normal. even hooked it up to the diagnostics and didn't find anything.
Has anybody else who has similar 4cyl Tacomas feels the same way about the way the truck runs? Have you done anything to improve it? any feedback on your experiences would be very much appreciated.