[Cruiserdrew]

Any oil change is better than no oil change, so if you want to use Royal Purple, go ahead. It will work fine, but then so will any number of lubes.

There is no science to say one synthetic is better than another, though most experience and long term results have been with Mobil1. They have the biggest market share, the best availability, and the biggest engineering department by far.

Like Amsoil, RP quotes lube qualities that may or may not be relevant to long term durability. In my view they are the new kids on the block with a stupid name, and therefore, are as yet, unworthy.

Me personally, I like Mobil1, not for any scientific reason, or because it runs 4 degrees cooler but because I've used it since 1984 and my cars have always gone to high miles with little wear. They have earned my business. Motor oil, gear oil, grease, ATF, I like it all. Just remember, that's opinion, not science.

Do some reading on Bobistheoilguy.com to get a perspective on all of the brand fights. My basic view-they are all good, and in most cases non-synthetics are just as good and cheaper. The key to longevity is having a maintanence interval and sticking to it, not exactly what you use.

I'm thinking that FJCs are built like other Toyotas and will run to very high mileage with just the routine changes prescribed by Toyota, so what oil to use is not a massively hard decision.