[csimo]

First off both part numbers are correct. The one I posted is Honda's part number, and the other this the accessory number. Both work.

Now on to your Amsoil question. Two parts to the answer.

First, the Amsoil oil and air filters are fine. Amsoil doesn't manufacture them, and you can usually find filters that are just as good or better for much less money.

As for Amsoil oil. I don't keep up with Amsoil much anymore, but the last I checked they had only one product line that was API Certified, and that was the XL-7500 line. That product is a synthetic blend and not the one they claim is for extended drain intervals. All of the fully synthetic Amsoil products are not API Certified.

Your Honda warranty requires you to use API Certified oil. If you don't then any potential engine warranty repairs may be out of your own pocket, or you will be in the position of trying to collect from Amsoil. It really doesn't matter to me if it's Amsoil or any other brand you should never use a non-API Certified oil.

Amsoil may make some good products, but we don't really know since they fail to subject their products to industry standard testing. They publish all kinds of supposedly "independent" tests, but most of that testing is using inappropriate tests for an internal combustion engine and are just plain worthless to me when they refuse to tell you who did the tests. For example a four ball test from an anonymous independent lab is a joke. The four ball test has little or nothing to do with an internal combustion engine (if I was testing gear lube I might give it some weight).

Extended drain intervals do not make sense for modern gasoline engines. Period. If we were driving large diesel engines (diesel fuel is not near the solvent that gasoline is) with huge tolerances and superior filtration it would make sense. Our engines have nothing in common with the real purpose of extended drain intervals. Anyone that pushes extended drain intervals is not your friend. Does this mean that our engine oil is really "worn out" at 7500 miles? Nope, but you would be much better off changing the oil and filter rather than spending about the same money for a good oil analysis to prove otherwise.

I consider Amsoil a snake oil company. They fill their representatives heads with lies... they are very effectively brainwashed into believing the invalid tests, and the various other lies told to them. The few that really take the time to learn the chemistry and physics involved feel foolish that they believed what Amsoil was pushing.

I could go on and on about this subject, but I think I hit the high points.

-Joe