I have a 2015 Acura MDX
The trans requires Honda DW-1. As shown in a thread the viscosity of that is 6.95 @100c. Now Redline shows D4 as a replacement for HONDA ATF Z1. D4 has a viscosity of 7.5 @ 100c which is higher than Z1. Now D6 is lower than either one of the Z1 or DW 1. Redline shows D6 as a replacement for DW-1. Honda did say at one point that DW 1 supersedes Z1. What the heck is the difference between DW1 and Z1? Does viscosity at 100C not as important as compared to engine oil? I've always been a person who prefers a higher viscosity at operating temp versus being lower. Is there any harm or foul and just going with the higher viscosity of the D4 versus D6? Currently I have a quarts of D6 in there now and it shifts beautifully. If I were to drain out four quarts and put in four quarts of D4 would that bring the viscosity closer to the stock viscosity of 6.95? What was really changed between DW1 and Z1?
The trans requires Honda DW-1. As shown in a thread the viscosity of that is 6.95 @100c. Now Redline shows D4 as a replacement for HONDA ATF Z1. D4 has a viscosity of 7.5 @ 100c which is higher than Z1. Now D6 is lower than either one of the Z1 or DW 1. Redline shows D6 as a replacement for DW-1. Honda did say at one point that DW 1 supersedes Z1. What the heck is the difference between DW1 and Z1? Does viscosity at 100C not as important as compared to engine oil? I've always been a person who prefers a higher viscosity at operating temp versus being lower. Is there any harm or foul and just going with the higher viscosity of the D4 versus D6? Currently I have a quarts of D6 in there now and it shifts beautifully. If I were to drain out four quarts and put in four quarts of D4 would that bring the viscosity closer to the stock viscosity of 6.95? What was really changed between DW1 and Z1?