The OEM oil for this vehicle is 5w30 synthetic. The manual may tell you to use a wide range of grades but at max, ppl here go for 10w30.
Why would you opt for such a thick oil as 20w50??
Now go and drain this mistake and refill with Honda OEM oil.
On a side note, I am unclear why this had happened. But apparently, saving couple of bucks seems to be the reason.
For 3.7 Litres,
20w50 @ ~Rs:1600 (Havoline)
10w30 @ ~Rs:1900 (Havoline)
5w30 @ ~Rs:2200 (OEM-Honda by Total)
5w30 @ Rs:3000 (OEM-Honda by CHevron) New!!
If we take comparison bw 1 & 3, the question comes down to
Would you rather save 600 and risk the engine of a 1.3 Mil Car??