is this oil too heavy?

[rclint]

The chart says time to reach the remotest lube point. That is a worthless chart if I have ever seen one as it means NOTHING !! I could care less how long it takes oil to reach the remotest lube point as I'm 100% sure oil is already at that point. Engine designers did not get to where they are, engines did not get to where they are by having a specific oil to reach a remotest oil lube point by such and such time, like I said oil is already at that point, and chances are if it's a priority for oil at that lube point there may be a oil catch point at this location.

I wonder how many people know not every single lube point in an engine is pressurized, most lube points are just that lube points and just need oil on them for lubrication.

 

[fdcg27]

I think you might be wrong about the requirement that the owner's manual recommend the same viscosity as that used in the emissions test, from which the fuel economy numbers are derived in some elegant way that I can't recall.
I believed this until we bought a Subaru.
In the Forester's manual, a starburst 5w30 is said to be prefered.
The manual then features an olde-tyme temp vs visc chart, allowing the use of classics like 10W-40 down to -4F, and then goes on to say that in severe conditions, things like a 20W-50 or a straight 30W or 40W may be used.
I think the "use 5w30 (or 5W-20) only" found in many owner's manuals may have more to do with the low opinion that manufacturers seem to have of their end users than the EPA.

 

[Steve S]

Originally Posted By: Hemi426
My thoughts are why wouldn't the Ice Road Truckers use synthetic 5w-40 in those conditions?
Once the engine is warmed up it doesen't matter what the viscosity at startup is . If I lived/ operated there I would buy one of those things that warm up the oil and coolant .

 

[stenerson]

I'm curious if UOA results suggest more wear with thicker oils?

 

[Bluestream]

Alright it's settled; we have a winner...15W40!

 

[Gary Allan]

Quote:
I think you might be wrong about the requirement that the owner's manual recommend the same viscosity as that used in the emissions test, from which the fuel economy numbers are derived in some elegant way that I can't recall.




The Soobie probably wasn't in threat of CAFE penalties. It probably had CAFE credits. Honda went to 5w-20 voluntarily. It already made the CAFE standard with surplus.

 

[Geonerd]

15W-X is probably a little thick for Ohio winters, But, now that the freezing temps are gone, Delv1300 will work great. Go for it.

Mo Thicka! Mo Bettah!

Your car on 15w40 --->

 

[fdcg27]

I don't know, since Subarus are not exactly the choice of hypermilers.
Fuel economy is not one of our Subaru's strong points, and the EPA mileage figures are rather depressing.

 

[demarpaint]

Originally Posted By: Gary Allan


The Soobie probably wasn't in threat of CAFE penalties. It probably had CAFE credits. Honda went to 5w-20 voluntarily. It already made the CAFE standard with surplus.


Interesting comments about Honda Gary. That would leave me to believe that Honda is pretty confident in the 5W20 oil since they made the CAFE requirements with surplus. They had nothing to worry about, and they could have just as easily spec'd 5W30 if they felt it was a better choice for all their engines.

 

[vxcalais]

Originally Posted By: fdcg27
I don't know, since Subarus are not exactly the choice of hypermilers.
Fuel economy is not one of our Subaru's strong points, and the EPA mileage figures are rather depressing.


For interest sake, a popular Subaru WRX performance engine builder in Australia recommends Mobil Delvac MX 15w40 to his customers.