0w-30/5w-30 in a 2024 crosstrek and subaru timing chains

[GSCJR]

0w-20

 

[Redhawk454]

FB2 liter was a 0w20 for Impreza and Crosstrek wife's 23 is 0W20.

The lubricant will flow to places it need to be, but controls and systems will balk at an overly viscous fluid and with an overboard HTHS and car will be unresponsive to a fault.

Been there and done it a few times over the past decade. If you DD a car from new, you will know if it is working well enough to design intent.
'
Only go as high on HTHS as you anticipate the necessity. Script on the oil fill cap is the starting point.

So is the fb2 available in other countries?

 

[ARCOgraphite]

With a 30-grade. Really.

I think you are trying to call out baloney, but you can reserve that skepticism for the layperson and the impressionable.

Traditional Asian 0w20 (Idemitsu) KV100 and HTHS were positioned somewhat lower than say a Ford 5W20 so that places it further away from a Dexos 1 spec 5W30.

We have tried going up a grade in various Subarus over the decade with no success.

No problem with our Ford/ Mazda 2 litre, it should have been filled with an XXw30 grade from the start.

So as with choosing underwear- it Depends

 

[ARCOgraphite]

I was curious on what was required when the vehicle first came out. Not a 2023 model year.

The FB 2.0 and 2.5 N.A. have always been 0w20, in fact they were pushing Subaru Genuine Synthetic to a fault.
I think the Subaru (Idemitsu) oil is better than any other OTC premium lube in overall performance, but you wouldn't expect to see anything alarming in a UOA using any near current ILSAC GF spec lube.

 

[Redhawk454]

The FB 2.0 and 2.5 N.A. have always been 0w20, in fact they were pushing Subaru Genuine Synthetic to a fault.
I think the Subaru (Idemitsu) oil is better than any other OTC premium lube in overall performance, but you wouldn't expect to see anything alarming in a UOA using any near current ILSAC GF spec lube.

even though ru doesn’t make or produce any of their oil. Why would ru’s formulated oil be better than say, amsoil or hpl? It’s likely all the same base stock with some kitchen sink formula additive pack.

 

[nthach]

Unless WRX is used by someone OCD on warm up and maximum fuel economy (not the reckless hypermiling) and engine longevity, WRX should be running 0 or 5W30. That is a budget high performance vehicle.

I actually may out 5W30 in my Fit spec’ed for 0W20 this summer when I potentially take it on long distance trips at high speed with 4-5 people and gears with the A/C blasting. I may lose 1-1.5 mpg but definitely lower the risk of wear with such a high load on the engine.

Unless it’s the 1.5T and maybe the J35 VCM engines, I wouldn’t hesitate to run a 0W-20 in a Honda. For the Subaru, it’s a bit more nuanced. A regular non-turbo FB20/25 won’t complain on 0W-20 but an ILSAC 5W-30 will do the engine a bit better if road trips involving the mountains and high speed are in play. But a turbo Subaru IMO is better served with a Euro C3/C6 ideally 5W-30 oil to help mitigate fuel dilution. The MPG difference is minuscule.

Honda tends to recommend 0W-20 everywhere, while Toyota and Subaru have the CAFE muzzle.

 

[Jetronic]

With a 30-grade. Really.

Not to mention, hths doesn't come into play for the hydraulics part, the shear isn't high enough. KV would be a better indicator

 

[ARCOgraphite]

Not to mention, hths doesn't come into play for the hydraulics part, the shear isn't high enough. KV would be a better indicator

But I ran it and it was inappropriate in some of my vehicles. So bench race all you want, when the rubber meets the road that is what matters. However implausible on the surface, just a cautionary tidbit. Take it or leave it.

 

[ARCOgraphite]

Not to mention, hths doesn't come into play for the hydraulics part, the shear isn't high enough. KV would be a better indicator

Sorry for being "testy" I think My turbotax session this past weekend was getting to me

I expect going up a grade to be like it was in the 90's Maybe just a little bit more sluggish during warm up then basically unaffected fuel milage and just a tad bit more quiet and smooth when given the GO.
- Ken

 

[Redhawk454]

I believe 0w-20 is to dainty for the load i put on my ru driving up the mountains and its too dainty for my driving habits. It's burning 3/4 of a quart in 3k miles. I do 3k mile oil change intervals so i just put some cheapo ow-20 in it again for this oil change. Oil reaching temperatures well north of 200 degrees is pretty common. Yesterday Oil hit 227 degrees climbing up the mountains. I'm switching to 0w-30 next oil change.