Mixing Dex VI (synthetic) with Dex III (Factory)
I'm about to change out my spin-on filter and all I found at the auto part store was Dex VI synthetic, was wondering if anyone has mixed the two before and if anything has happened. only wanting to fill the filter and if it needs topped off (not doing a flush or changing). its been about 34k miles since the spin-on was changed.
I plan to switch over to TranSynd in 2-5 months (why i'm not changing all the fluid) but I still want to change the spin because it hasn't been changed in a long time, and going on a round 1500 mile trip (pulling 2 jet skis) for vacation. I have put 22k of the 34k miles on it haven't towed anything heavy all I do is city+highway(50-60mph) driving daily.
2005 Chevy 3500 CC LB
LLY ENGINE DIESEL, 8 CYL, 6.6L, DI, V8, TURBO-HIGH, DURAMAX 6.6-2 DURAMAX(LLY)