Oil change Color Options

[Oreo20]

Ok so its been 5k miles from my last oil change but the oil doesn't look dark black still has its nice clear dark color do I have to change it cause its been 5k miles or not ?

[Bitter]

So that they would shift well when cold, otherwise thick gear oil + heavy loads + trying to shift with molasses at -20 = unhappy customer and many broken transmissions under warranty.

However being very thin oils, especially when warm, when the synchro's begin to wear a little the oil lacks the 'stick' to get them spinning the next gear to change gear smoothly, so a thin but sticky oil like LWSP blended with the ATF gives it the stick it needs but the mix stays thin enough to still shift well when cold. Running straight LWSP would be too thick in the trans when it's cold I believe. LWSP also has a fairly good EP additive package to protect the hard parts too which is a benefit to an older trans also I believe. Other people hate LWSP with a passion, but for her trans it's worked great blended with Mercon.