Bought a Toyota for its quality and reliability.... why would you go with anything other than OEM?

Thanks for the feedback! I'm hoping the new housing works as yours have; it looks better if nothing else (until the unruly skid plate covers it up).


Sent from my iPhone using Tapatalk

you're gonna want to fill in Toyota's engineers on that then (ambient temp/viscosity chart on page 337). this is for the FJ sold down under between Feb 2011-Aug 2016.

every car i've owned shows a similar chart in the owners manual. sure, oil temps settle close to water temps just putzing around town but they'll rise independently if you run the engine hard, regardless of water temp. the hotter the ambient temps, the harder it is the for the oil circuit to shed the heat and come back down to normal temps unless you take the load/RPMs off the engine or add a cooler. a good example would be towing a heavy trailer up a long grade in desert heat...extended high RPMs and constant high load.

i could be wrong but this sounds like you're talking flashpoint, not viscosity. the flashpoint of most synths is between 400-430F. that's where the oil gets so hot that the vapor around it will literally catch on fire if exposed to an ignition source. you're absolutely right though, by that temp you've turned your engine into slag anyway.

oil at 220 is ideal. at 250 degrees the viscosity of an oil will start to dive. by 280F a 20wt is at about half its designated viscosity (using this approximate calculator and this report on TGMO's 40/100C values...start the chart at 100c). bad news for oil pressure.

an extreme example for sure but shows how viscosity dips at higher oil temps in hotter climates.

Metal housing is much smoother. Spins all the way down until the o ring seats and then I snug it. Much nicer install than the plastic housing.

All technically true, but in practice, if you have a functional cooling system you will overheat that before your oil temp ever gets to a damaging temp. I agree that oil temps will fluctuate independently for brief periods, but in normal driving I find that the coolant will keep that range within tolerance for any modern oil. All this being dependent on a cooling system with enough reserve to cover the range......4Runner seems to do that nicely as I live in one of the hottest places cars are used and can't raise the temp more than a tick over the middle of the gauge in 120+ here. Yes, air temp adds a increased load to the system, but it is sized appropriately and can shed the extra heat effectively from my experience.

fair points

i think going by Toyota's 5k mile oil change regimen in those situations doesn't hurt either.

I need a rear diff breather for my new rig but paying for the ARB is ridiculous. I just need a basic two way valve that will fit, then I can run some basic hose. Do you guys know of anything or the thread dimensions?

Did you mean to post in an engine oil thread?

Anyways, the 3 parts you will need.

Union, part# 90404-51319
Breather, part# 90930-03136
10' or so of 5/16" fuel line

4Runner Rear Diff Breather Extension - Toyota 120 Platforms Forum

or follow any of the ARB instructions, as it's basically same thing.

Thank you Sir

QSUD 5w30 just took 4th Place out of 228 oils tested. Wow!!! See the results for yourself.


MOTOR OIL ENGINEERING TEST DATA | 540 RAT - Tech Facts, NOT Myths

In the spring of 2016 eight 0W-20 motors oils were tested with these rankings:

“ 1. 0W20 Quaker State Ultimate Durability, API SN, synthetic (gold bottle) = 124,393 psi
Its onset of Thermal Breakdown = 270*F
.
.
2. 0W20 Toyota Motor Oil, API SN, synthetic = 101,460 psi
Its onset of Thermal Breakdown = 255*F
.
.
3. 0W20 Mobil 1 Extended Performance, API SN, dexos 1 approved, synthetic = 100,229 psi
Its onset of Thermal Breakdown = 265*F
.
.
4. 0W20 Pennzoil Platinum, Pure Plus Technology, made from Natural Gas, API SN, synthetic
(silver bottle with blue vertical stripe on the label) = 92,504 psi
It’s onset of Thermal Breakdown = 275*F
.
.
5. 0W20 Castrol Edge, Fluid Titanium Technology, API SN, dexos 1 approved, synthetic
(black bottle) = 90,745 psi
It’s onset of Thermal Breakdown = 270*F
.
.
6. 0W20 Valvoline SynPower, API SN, synthetic = 89,556 psi
It’s onset of Thermal Breakdown = 270*F
.
.
7. 0W20 Mobil 1 Advance Fuel Economy, API SN, dexos 1 approved, synthetic = 79,612 psi
It’s onset of Thermal Breakdown = 270*F
.
.
8. 0W20 Kendall GT-1, with liquid Titanium, API SN, synthetic = 71,385 psi
It’s onset of Thermal Breakdown = 260*F .”

Yep, QSUD has been one of the most consistent oils being made, despite the move to SN Plus. Qudos to QS for being so consistent! Add the Walmart price and its hard to beat.
20 weight oils definitely have their place, guys up in Canada are eliminating piston slap in the 5.7 Hemi with 0w20’s in the freezing cold. The move to 20 weight oil is a double edged sword imo. It has forced oil manufacturers to develop better oils but the service range is limited.

FYI, you can get the Rotella Gas Truck oil for $8/5qts from TSC store with the $10 rebate.

Good information

Interesting links