Originally Posted By: Grambo
yes, other people on the board are going to bash me but, letting your engine coming up to operating temperature is crucial before you step on it. what vehicle are you talking about to warm up? Ive had many Nissan's including a Sentra Spec V with a Maxima VQ35 swap and i always let the car warm up. Also i had manual transmission that wouldnt go into 2nd gear if it was cold because i had a mix of redline and M1 tranny fluid in.
Driving gently is all that is needed, to avoid any issues during warmup. Letting an engine come up to temp while idling wastes fuel, and causes more wear, not less.
And Redling MTL or MT 90 (Whichever is the appropriate grade for your transmission) would end that cold shifting problem.