My owner's manual for my 4WD Tacoma says for my transfer case and manual transmission to use "Gear oil API GL-4 or GL-5".
I changed the factory fill last fall with Redline GL4 Synthetic, per the recommendations at tacomaworld.com.
Is it the case that GL-4 and GL-5 are just different, or is one better than the other? I know that Gl-4 is supposedly easier on yellow metals.
Is Gl-4 the best choice for my truck? Or should I have used a Gl-5?
I changed the factory fill last fall with Redline GL4 Synthetic, per the recommendations at tacomaworld.com.
Is it the case that GL-4 and GL-5 are just different, or is one better than the other? I know that Gl-4 is supposedly easier on yellow metals.
Is Gl-4 the best choice for my truck? Or should I have used a Gl-5?