You can use ANY 5W-20. It's ALL part-synthetic. That's why it's more
expensive.

If the ambient temperature in your area does not get down to freezing, you
can use ordinary non-synthetic 10W-30. If it does, use ordinary 5W-30
during those periods.

You can mix them, too. They are ALL compatible, provided you are mixing
GF-4 with GF-4.

Check your Owner's Manual to see if your engine requires oil that's GF-4
certified. If so, make sure the 10W-30 or 5W-30 you buy says that on the
rear of the label. 5W-20 will be GF-4 in any case.

Hello again,

Much thanks for replies and help.
A bit confused on this.

Are you folks saying that the 5W 20 that Honda says to use Must be (all)
Synthetic only ?

Or is 5W 20 that is not synthetic, just the regular stuff, is O.K. ?

I read somewhere that they should not be mixed, so really confused.

Thanks again,
Bob

---------------------

Hello:

Have an Accord, 6 cyl, 2005.

Manual says to use 5W 20 oil, a bit surprisingly.

How critical is this ?

If I use, due to 5W 20 not being available, e.g., 5W 30, or 10W 30, any
potential problems ?

Thanks,
Bob