My plan was to change transmission fluid, transfer case and front and rear diffs today. Went to all auto stores around here and nobody had enough reg gear oil for me of same brand, I didn't want to mix and match. I could have gotten synthetic, Ran lucas synthetics last time in transmission/ transfer case. I just don't feel like spending the extra cash on synthetics right now. I have a farm and feed store here. They have plenty of oil in a brand called Mystik( spelling?). Pretty cheap. Anyone have any experience with this brand?