I understand that Mobil 1 is not the same as TGMO.

There was posts saying Lexus engineering wanted a different additive package for their engines versus what Mobil sells

Keep in mind that oil companies are constantly changing their formulas, additive packages and agreements with other companies/manufacturers.

For instance, just this summer I noticed Walmart's synthetic oil formula had changed (for what looked like the better). And the newer Dexos approved cirtifications - which most oils subscribe to - now require a minimum NOACK rating of 13. With most 0w20 oils getting down bellow ten, which I guess is an improvement.

But Toyota genuine synthetic has always been considered an excellent oil, and I'm sure it still is.

i would think that the dual injection system and the larger than normal oil capacity and the extended change intervals and the low rpm nature of the engine might require a specific oil?

some reports here and other forums of some engines starting to use oil at 175k range.

The 346k full dealer serviced ls460 posted here is what I would like.

A certain amount of oil engineering seems to be a good idea to match the engine and the rings..

my engine builds for off road bikes has allowed me long term hard use oil comparisons.

Mobil 1 with its friction modifiers had nearly zero cylinder/piston wear.

Offset by much higher ring wear and very poor transmission gear mating teeth face wear.

gave away $130 of red top Mobil 1 after that.

Earlier Mobil 1 did not exhibit this.

my 63k-70k TGMO personal car test using 0-20 showed lightly discolored oil at the change and one quart consumption.

will change again at 77k miles and use TGMO 5-20 to see if any visible consumption difference

Out of curiosity, where did you get this info from?