ok i ran rotela 15 40 dino for the first oil change only 1000 miles than went to rotela synthetic new formula 5 40 . it worked good for the first 1000 but now with 2500 it shifts horably and i even get the start up chain ratle the connie and zx14 are known for . i was thinking of running a 50 weight because it is garunteed to sheer to the 40 weight soon enough . the mobil silver cap seems like a good choice but i have read that it is not a true sythetic class 3 is this true? i am thinking about mobil mx4t , amsoil , mobil silver 15 50 silver . i have read till my eyes hurt and would just like some opinions . the 1400 motor sheers oil fast so i think going to a 50 weight would be wise. i run purolator pure one filters and change my oil every 3000 or so .