My box resists shifting on cold mornings

[rdass623]

that is common on manual gearboxes which use 75w90 gear oil (also known as extreme pressure grease) use of a high quality synthetic oil will help, ford's motorcraft oil used in the miatas works very well. but the only real fix is to let the car warm up before driving it. shifting will always be heavier before the gear oil gets up to operating temp. if you leave the car idling, transmission in neutral foot off the clutch, for about two minutes before driving off it will be a lot better.