[DEWFPO]

I was always told not to put Synthetic oil in the engine till everything is well seated. About 30,000 miles or when factory warrenty is up. Also 0 w 30 here in Florida? Mabe in Alaska but here I think 10 w 40 at least. I also plan on using synthetic in the diffs and trasfer case but not till around 15,000 miles so they have time to polish and seat together. Just my .02 and I'm leaning toward Redline Synthetic Oil.

Welcome JR1,

Based on the vast experience of the forum members here (almost 20,000 as of today), you would be well advised to change out your rear differential fluid at about 5k miles or so. You can wait till 10k or 15k on the transfer case and front differential if you want.

The 1GR-GE engine is spec'd (here in the US) for 5W30. That being said, a 0W30, 5W30 or 10W30 will all have similar viscosities (within a specified range) at operating temperature (100 degrees C). So a 0W30 is not necessarily thinner than a 10W30 at operating temperature.

Redline makes good products and they will serve you well.

DEWFPO

 

[DEWFPO]

Also an old woman's tale about axles and synthetic oil. A lot of axles are factory filled with synthetic. Apparently, all 2008 TOyota including FJ have synthetic gear oil. Almost all HD trucking axles have synthetic oil, as do most domestic trucks

Here is our discussion of the Toyota synthetic gear oil TSB
http://www.fjcruiserforums.com/forums/maintenance-tech/60405-differential-gear-oil-tsb.html

My '05 Silverado 2500HD built in '04 came from the factory with GM's synthetic 'grape juice' in the rear differential.

DEWFPO

 

[DEWFPO]

So quick question... after swapping out my oil for Mobil 1.... do I still go with the 5,000 intervals?

-B

That is completely up to you.

I switched over to synthetic at 5,000 miles and now I change out at ~8-9,000 mile intervals. I keep an eye on the oil and it depends on how much of my driving during that period is considered 'severe', as in very dusty conditions, 4 wheeling, etc...

DEWFPO