Switching to 5w30

[kschachn]

There is also an increase in bearing wear if you increase viscosity beyond the minumun requirements. For temps of 230F I'd say protection is there with a 229.71 oil. Maybe someone with far more knowledge has some more input on this topic though.

Where do you see that?

 

[TurboZedd-R]

Where do you see that?

https://bobistheoilguy.com/forums/threads/moft-hthsv-vii-and-wear-its-complicated.309930/

 

[kschachn]

https://bobistheoilguy.com/forums/threads/moft-hthsv-vii-and-wear-its-complicated.309930/

I don’t see anything in that thread that supports your statement. If any such wear occurs it is at a HT/HS way higher then any 30 or 40-grade oil. His mention of “catastrophic wear” is very much out of context here. Within typical SAE grades wear always decreases with increasing MOFT.

Besides the OP there had some highly suspect notions that were discredited.

 

[TurboZedd-R]

I don’t see anything in that thread that supports your statement. If any such wear occurs it is at a HT/HS way higher then any 30 or 40-grade oil. His mention of “catastrophic wear” is very much out of context here. Within typical SAE grades wear always decreases with increasing MOFT.

Besides the OP there had some highly suspect notions that were discredited.

Regardless of how far in the weeds we go, a 229.71 spec is more than enough for a stock FA20.

 

[Fa24wrx]

Regardless of how far in the weeds we go, a 229.71 spec is more than enough for a stock FA20.

FA24 LOL but great info and convo.

 

[ZeeOSix]

So, I've decided to switch my 2022 wrx from 0w20 to 5w30 during summer (georgia heat).

Being in GA, why not just run 5W-30 (or a 0W-30) all year round. 5W is fine for GA "winters".

 

[Fa24wrx]

Being in GA, why not just run 5W-30 all year round. 5W is fine for GA "winters".

That's probably what I'll do so I don't have to switch back and forth and have 100% 5w30. Ideally, I'll find a 0w30. I prefer the flow characteristics of 0w even if it's a hair better for start up since that seems to be a good amount of where the wear may come from.

 

[ZeeOSix]

It states "a thicker viscosity may be used in hotter temperature environments."

The secret engineering loop-hole statement saying keep the HTHS up.

 

[Fa24wrx]

The secret engineering loop-hole statement saying keep the HTHS up.

Think the Valvoline EP 5W30 will be fine for my application? 3-3.5k OCI with occasional spirited driving including some WOT? HTHS on that is 3.2

 

[kschachn]

That's probably what I'll do so I don't have to switch back and forth and have 100% 5w30. Ideally, I'll find a 0w30. I prefer the flow characteristics of 0w even if it's a hair better for start up since that seems to be a good amount of where the wear may come from.

Unless you were starting at around -35 then a 0W winter rating will have no benefit.

And the majority of wear does not occur at startup.

 

[ZeeOSix]

Think the Valvoline EP 5W30 will be fine for my application? 3-3.5k OCI with occasional spirited driving including some WOT? HTHS on that is 3.2

Yes ... that's a good HTHS in a xW-30. I'm probably going with the same oil in my Coyote next oil change. Currently running Valvoline Advanced, which is also good oil.

 

[Pablo]

Page 6

Have we established 5W-30 level yet?

 

[Ronin73]

Think the Valvoline EP 5W30 will be fine for my application? 3-3.5k OCI with occasional spirited driving including some WOT? HTHS on that is 3.2

Yes

 

[Ronin73]

Yes ... that's a good HTHS in a xW-30. I'm probably going with the same oil in my Coyote next oil change. Currently running Valvoline Advanced, which is also good oil.

That Valvoline EP ran great in my Coyote. Great oil.

 

[Fa24wrx]

That Valvoline EP ran great in my Coyote. Great oil.

Nice. May go that way then

 

[Rand]

FA24 LOL but great info and convo.

Technically FA24F or FA24DIT since there is a N/A version too.

 

[ZeeOSix]

Your max oil temperature of 110°C is really not that high. An API 5W-30 at that temperature will be equivalent to a 0W-20 oil at ~103°C. These cars can hit upwards of 115°C on the street and 125°C on track, and engines and oils tend to be tested with sump temperatures of up to 150°C. You'll have plenty of margin with an API 5W-30.

Are you talking about the test temperature of 150C to measure the oil HTHS viscosity? Or are you saying that running engines in a test lab are actually ran with the oil temperature in the sump being at 150C ?

 

[Fabulous50s]

You'd run 0w20 in a turbo boxer with oil temps hitting 230f?

Aw hewl nah!

 

[twX]

Are you talking about the test temperature of 150C to measure the oil HTHS viscosity? Or are you saying that running engines in a test lab are actually ran with the oil temperature in the sump being at 150C ?

I'm referring to engine tests with 150°C oil temperatures, either measured in the sump or main gallery.

The Sequence IIIH test used for API SP is a 90 hour test with the oil at 151°C. All of the studies I've seen that look at engine wear vs HTHS use oil temperatures of 130-150°C, usually regulated with oil heaters.

I'd imagine car manufacturers use similar conditions for stress testing their engines with the intended grade of oil.

 

[ZeeOSix]

I'm referring to engine tests with 150°C oil temperatures, either measured in the sump or main gallery.

The Sequence IIIH test used for API SP is a 90 hour test with the oil at 151°C. All of the studies I've seen that look at engine wear vs HTHS use oil temperatures of 130-150°C, usually regulated with oil heaters.

I'd imagine car manufacturers use similar conditions for stress testing their engines with the intended grade of oil.

That test is primarily to test the oil for viscosity thickening, oxidation and deposits/ring sticking. Obviously it's a stress test, and conditions like that would only be seen on a race track, nothing close to those kind of temperatures with normal street use as you mentioned earlier. Racers change oil on a heavily tracked car quite often ... or at least they should.

Any oils with the following specs will pass the criteria of that test. Pass/fail on the GF-6 is better, but pretty much all oils on the shelf are ILSAC GF-6 by now.

API Category – SN, SN PLUS, SP
ILSAC category – GF-5, GF-6

Link to the SWRI description of the Sequence IIIH testing.
https://www.swri.org/sites/default/files/sequence-iiih-test.pdf