Update: 5W-30 & Heavier Recommended RoTW (4 Viewers)

[2021 LC200]

Anybody knows for sure that GM after decades of building engines decided to not machine the bearing surfaces to a smooth finish and that is the issue at play?

I find that hard to believe. It is more to do with indeed running to low oil viscosity, higher mileage change intervals, weaker piston rings letting more fuel by, perhaps changes in the lubrication system or increased operating temperature for efficiency. As a result 0W20 is running to thin or gets diluted and it just needs -30 or -40 allowing for some viscosity breakdown allowance.

All in all in a new build GM with that engine I would run the more viscous oil (0W40 or 5W40), what ever they say about it.

 

[S.CarolinaFZJ80]

Thanks @Julian73
The beginning of that part number was obscured in a picture in this thread.
5W-30 Oil filler cap with white font, 12180-0H012
View attachment 3286434

For future reference, Here is the other 5W-30 oil filler cap, part number 12180-38030, with blue Lexus font that @bjowett found

View attachment 3286447

I am on my 3rd oil change with 5W-30 at 5k intervals. So far so good, as expected.

Oil is plenty dark at 5k

So far so good, it has higher oil pressure, obviously.

At initial start and at idle with the AC on. With 0W-20 idle pressure was a tick below the 1/4 mark

 

[gasman4u]

Pontificating is fun though

Anybody knows for sure that GM after decades of building engines decided to not machine the bearing surfaces to a smooth finish and that is the issue at play?

I find that hard to believe. It is more to do with indeed running to low oil viscosity, higher mileage change intervals, weaker piston rings letting more fuel by, perhaps changes in the lubrication system or increased operating temperature for efficiency. As a result 0W20 is running to thin or gets diluted and it just needs -30 or -40 allowing for some viscosity breakdown allowance.

All in all in a new build GM with that engine I would run the more viscous oil (0W40 or 5W40), what ever they say about it.

Toyota’s 3.5 TT with all the machining debris issues has entered the chat…

 

[xeuxaz]

Toyota’s 3.5 TT with all the machining debris issues has entered the chat…

 

[2021 LC200]

Toyota’s 3.5 TT with all the machining debris issues has entered the chat…

Yep, could well be the thin oil, short drives and dilution making it even thinner, 10k intervals and resulting metal to metal contact adding to the misery.

 

[xeuxaz]

I am on my 3rd oil change with 5W-30 at 5k intervals. So far so good, as expected.
View attachment 3914030

Oil is plenty dark at 5kView attachment 3914031

So far so good, it has higher oil pressure, obviously.

At initial start and at idle with the AC on. With 0W-20 idle pressure was a tick below the 1/4 markView attachment 3914032View attachment 3914033

I love the attention to detail with the matching 5w30 fill cap swap. Nicely done.

 

[2021 LC200]

I changed my cap as well to 5W30 incase on a long road trip in the future i go to a lubrication place instead of DIY.

 

[Mingus Dew]

Anybody knows for sure that GM after decades of building engines decided to not machine the bearing surfaces to a smooth finish and that is the issue at play?

I find that hard to believe. It is more to do with indeed running to low oil viscosity, higher mileage change intervals, weaker piston rings letting more fuel by, perhaps changes in the lubrication system or increased operating temperature for efficiency. As a result 0W20 is running to thin or gets diluted and it just needs -30 or -40 allowing for some viscosity breakdown allowance.

All in all in a new build GM with that engine I would run the more viscous oil (0W40 or 5W40), what ever they say about it.

TL;DR - They did in fact do a s*** job machining these engines however the 0W20 is still to blame in a sense because it drastically reduced margin of error in operation.

Crappy machine work + low viscosity oil for some MPG gains = recall

 

[stonepa]

I changed my cap as well to 5W30 incase on a long road trip in the future i go to a lubrication place instead of DIY.

I was chastised by the senior Toyota tech at my dealer for replacing the oil fill cap with a Toyota 5W30. I have thick skin and disregarded his admonition.

 

[Artie]

I was chastised by the senior Toyota tech at my dealer for replacing the oil fill cap with a Toyota 5W30. I have thick skin and disregarded his admonition.

The type of guy who replaces the cap isn’t typically the type who then goes to deal with a service tech.

I feel like you enjoyed this.

 

[Boston Mangler]

I love the attention to detail with the matching 5w30 fill cap swap. Nicely done.

Oooh, good eye…. Just ordered same

 

[gasman4u]

I was chastised by the senior Toyota tech at my dealer for replacing the oil fill cap with a Toyota 5W30. I have thick skin and disregarded his admonition.

I hope it was in public. Near the red plastic chairs in the waiting room.

 

[2014 LEX 570 GA]

Oooh, good eye…. Just ordered same

Where you do you find OEM Toyota one, or at least one that is high quality?

 

[Boston Mangler]

Where you do you find OEM Toyota one, or at least one that is high quality?

https://amzn.to/45vaW0P

 

[gasman4u]

Where you do you find OEM Toyota one, or at least one that is high quality?

master tech shellacking NOT included, but if you play your cards right with the dealership...it too can be yours! aMiRItE @stonepa ?!?!

 

[xeuxaz]

My 16 joined the crew.

 

[Zill]

My 16 joined the crew.

View attachment 3917278

“Energy Conserving”

 

[Quidnam]

My 16 joined the crew.

View attachment 3917278

I changed my cap a couple months ago, but haven't gotten around to actually putting the 5W-30 in it yet...

 

[Quidnam]

“Energy Conserving”

It's a misspelling of "Engine"

 

[FrazzledHunter]

I changed my cap as well to 5W30 incase on a long road trip in the future i go to a lubrication place instead of DIY.

I wonder if there's a 0w-30 cap out there.