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D3, D4, and D5 are all just *DRIVE* like on any automatic transmission, EXCEPT that the number next to the D is the "highest gear the automatic transmission will go into". The Acura just gives you a choice, in case you don't want to go into a higher gear (like if it's slippery traction or a steep hill, etc.)
1 means: Manual gear. FIRST GEAR ONLY. 2 means: Manual gear. SECOND GEAR ONLY. D3 means: Use automatic transmission, but engine will never shift above 3rd gear. D4 means: Use automatic transmission, but engine will never shift above 4th gear. D5 means: Use automatic transmission, but engine will never shift above 5th gear.
use d4. d4 is for normal driving. d3 is to down shift the transmission in case you wanna pass. use d3 only if you want to down shift because if you leave your car in d3 on the highway, it doesnt allow the 4th gear to engage, causing your engine to run at higher revs, not only wasting more gas but also making your engines life last less. hope this helps. if you need more help, let me know. goodluck
check transmission fluid level- run/drive for about 10 min. , park car- check with engine running- add fluid if needed- ,if fluid NOT low- transmission filter needs to be changed
some people will tell you that d3 is for town and d4 for the open road,that is totally wrong.D3 is for engine braking when going down a mountain(saves the engine/gearbox doing too many changes)so leave it in D4 for everyday use.....also saves you fuel..
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