'21 Sienna 2.5l hybrid 202k mi; PU 0w-20 4.6k mi

[PWMDMD]

Stupid thing is at 156 degrees after 90 minutes on the highway

View attachment 285473

Wow...my 25 Forester with the NA 2.5 gets up to 230F quickly on the highway if the engine is working hard and hovers around 205F when it's not. Or at least, that's what the car says on the screen.

 

[edyvw]

I’m semi surprised the fuel dilution is still relatively high on an engine that is both port and direct injected. My dad’s 2016 F150 with 2.7L is direct injection only and had over 5% fuel dilution in 12k miles. It is terrible.

Port injection only works in certain situations. It is there just to prevent IVD. DI works all the time.

 

[Sienna dude]

Wear looks fine, whats the worry?

Or 0W-30?

Like I said before, viscosity is not the issue, will not do any better with 0w30 other than unnecessarily hurt my gas mileage. This motor runs cold. Wear numbers look fine on the uoa but I don't know if we should take uoa numbers seriously. Fuel in the oil is bad, viscosity loss is not the only harm that fuel does

 

[Sienna dude]

Wow...my 25 Forester with the NA 2.5 gets up to 230F quickly on the highway if the engine is working hard and hovers around 205F when it's not. Or at least, that's what the car says on the screen.

Ha! Good luck getting this thing over 200, not going to happen

 

[Sienna dude]

I've been fooling myself all these years that I don't have a bad driving habit, that I drive a lot on the highway. But what good is driving on the highway at 170° oil temp.

 

[6.7 CTD]

Same engine, however non-hybrid using 0w30 (hths 3.009). Posting for fuel dilution reference. 6k miles on this oci.

 

[Sienna dude]

Ultra slipped from 8.8 to 7.8, and I really believe that is all due to fuel. This motor doesn't have the muscle to shear anything lol

 

[Sienna dude]

Same engine, however non-hybrid using 0w30 (hths 3.009). Posting for fuel dilution reference. 6k miles on this oci.View attachment 285481View attachment 285482

How do you achieve low fuel that's my question?

 

[Sienna dude]

Maybe there is something wrong with my motor that I need to fix, like PCV valve or cleaning of the EGR or something. Fellow Sienna owners are recommending that

 

[facility1]

5w-30 Pennzoil ultra Platinum helped my Subaru engine. all the way around and with fuel dilution too.

 

[6.7 CTD]

How do you achieve low fuel that's my question?

This vehicle sees frequent stop-and-go traffic, including highway driving, and prolonged idle times during colder months. My wife drives it daily, covering about 14-15k annually.

 

[Sienna dude]

5w-30 Pennzoil ultra Platinum helped my Subaru engine. all the way around and with fuel dilution too.

Helped like how?

 

[Sienna dude]

This vehicle sees frequent stop-and-go traffic, including highway driving, and prolonged idle times during colder months. My wife drives it daily, covering about 14-15k annually.

I cover your annual miles in less than 3 months. And my fuel is higher than yours, it means my engine has some problem?

 

[Nessism1]

First off, get another analysis performed, by a lab that has the proper equipment to check for fuel

Secondly, even if fuel is there, that's not a death sentence for the engine. You can go to shorter change intervals, thicker oil, or just ignore the fuel.

The Honda 1.5T is often lambasted for high fuel, but the durability seems excellent (occasional head gasket blowing on high turbo pressure models excepted).

 

[Sienna dude]

First off, get another analysis performed, by a lab that has the proper equipment to check for fuel

Secondly, even if fuel is there, that's not a death sentence for the engine. You can go to shorter change intervals, thicker oil, or just ignore the fuel.

The Honda 1.5T is often lambasted for high fuel, but the durability seems excellent (occasional head gasket blowing on high turbo pressure models excepted).

Another oil analysis is a good idea

 

[Oillover]

I would like to have no fuel in there to begin with

Have you tried running premium (high octane) fuel?

My Honda is DI as well, with no turbo.
Within the first week or so, I knew I was going to have a problem as the oil in the dipstick reeked of fuel.
On a whim I tried 91 octane (which is considered "premium" in Canada.
After a couple of tanks and a bit or hard driving (higher RPM's etc), the fuel smell all but disappeared.

Not saying this will work but try it for a while and see if you observe any difference in oil dilution.

 

[edyvw]

I've been fooling myself all these years that I don't have a bad driving habit, that I drive a lot on the highway. But what good is driving on the highway at 170° oil temp.

Are others seeing the same temperature? What is your coolant temperature?

 

[6.7 CTD]

I cover your annual miles in less than 3 months. And my fuel is higher than yours, it means my engine has some problem?

Personally, I don’t think yours has any issues. Your fuel dilution isn’t that bad, likely due to prolonged idling as you suspected.

 

[Sienna dude]

First off, get another analysis performed, by a lab that has the proper equipment to check for fuel

Secondly, even if fuel is there, that's not a death sentence for the engine. You can go to shorter change intervals, thicker oil, or just ignore the fuel.

The Honda 1.5T is often lambasted for high fuel, but the durability seems excellent (occasional head gasket blowing on high turbo pressure models excepted).

You raised a great point about the durability of these engines. Toyota and Honda must have considered fuel while designing these motors. Maybe I shouldn't worry and just keep going. I have made it to 200k, the engine runs perfectly fine.

 

[FZ1]

Ultra slipped from 8.8 to 7.8, and I really believe that is all due to fuel. This motor doesn't have the muscle to shear anything lol

The good news is there is no wear so you are good to go. The FD is what it is. My 2.5 likes PUP.