Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB

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- - Re-evaluating 0w20 (https://www.ft86club.com/forums/showthread.php?t=66078)

Re-evaluating 0w20

My understanding is the FA20T in the new WRX is calling for 5w-30 or 40 ? This is a car that isn't made by Toyota and hypersensitive to tenths of a gallon mpg savings.

Maybe 0w30 or 0w40 is best for this FA20 ?

Fa20dit in the Forrester says 30 weight.

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*W-30 is pretty commonly recommended on this forum for turbocharged engines. For NA engines, the consensus is that 20 weight is better.

When I told my father in law (30 year transmission mechanic, shifter kart racer) that both the Accord Coupe and the BRZ called for 0w20, he said, "You might as well piss in it". LOL.

Quote:

Originally Posted by robwbright (Post 1743933)

When I told my father in law (30 year transmission mechanic, shifter kart racer) that both the Accord Coupe and the BRZ called for 0w20, he said, "You might as well piss in it". LOL.

Pay no attention to us old coots ...... :sigh:

humfrz

At 212f, the difference between a 20 and a 30 is pretty small. At that temp they're both "piss".

This is a common issue old timers have with the newer engines. They can't understand the use of such thins oils(for instance Honda is switching to 0W16 this year), what most are failing to note is that the tolerances in factory engines over the last 10 years are considerably tighter then they were previously. This allows for the use of thinner oils without any detrimental effect, the other side of this coin is that the oils themselves have also improved drastically over the past 10-15years. The FA20 calling for 0W20 doesn't worry me at all, Toyota has been putting 0W20 in the 2U-ZFE and 3U-ZFE, supercharged or not, for about 6-7years now, I've not seen one fail due to an oiling issue yet. We've had more issues from customers running conventional 5W20 to it's limits(work truck, excessive idling, short trips, etc), the VVT system doesn't like sludge, something we don't see if the owners are running 0W20 TGMO, it seems to keep things cleaner longer.

Quote:

...Originally, ILSAC GF-6 was targeted an early 2016 introduction and delayed the first time until September 30, 2016. The latest date is now January 1, 2017. Progress on the new GF-6 engine tests is slow and much work remains.

http://gf-6.com/node/73
OMG, you're using 0W-20??!? That stuff is SO thick?!?! :eyebulge: :D

On another note, the 5 or 6 uoa's posted on various forums from the FA20DIT Forester are all showing high fuel contamination and very low 20 grade viscosity from the fuel. That's probably the good part about the 86's not getting factory turbos. They still have a lot of work to do with DI, IMO. And the WRX's/Forester's have Subaru's DI, IIRC, not Toyota's. :bonk:

-Dennis

Quote:

Originally Posted by bluesubie (Post 1745724)

UOA's over the years have shown that the n/a EJ Subaru's are much easier on oil than the turbos, so no need to bump the viscosity if it's not really needed IMO (and if you have a trend of good uoa's). You need to compare apples to apples. :) Although the 86 does have language saying that you can go to a higher viscosity during certain driving conditions, and the other Subaru's no longer have this language like they used to.

The new WRX will probably have the same language in the manual as it does now. 5W-30 synthetic required and "5W-40 conventional" [sic] is allowed for replenishment only. There's an old post at nasioc about CAFE standards and the fines for not meeting minimum MPG requirements across the entire fleet for a manufacturer are hefty.

rice - good point about the viscosity. With a Resource Conserving 5W-30, there is little difference in operational viscosity as many 5W-30's shear to a 20 grade with use anyway.

Maritime - GF-6, which will have 0W-16, is actually being delayed a couple more years. Looks like they're not ready for it yet.

http://gf-6.com/node/73
OMG, you're using 0W-20??!? That stuff is SO thick?!?! :eyebulge: :D

On another note, the 5 or 6 uoa's posted on various forums from the FA20DIT Forester are all showing high fuel contamination and very low 20 grade viscosity from the fuel. That's probably the good part about the 86's not getting factory turbos. They still have a lot of work to do with DI, IMO. And the WRX's/Forester's have Subaru's DI, IIRC, not Toyota's. :bonk:

-Dennis

When I switched from 5w30 to ow20 Mazda I found the engine ran better. My only concern is the rod bearings. The crank is the same on the FA20T so 30 weight might not be a bad idea.

Quote:

Originally Posted by regal (Post 1743918)

... so what is the reason for the heavier oil for the nonturbo FA20??

-alex

Quote:

Originally Posted by mav1178 (Post 1746080)

... so what is the reason for the heavier oil for the nonturbo FA20??

-alex

To prepare it for dat turbo lyfe :lol::lol:

The consensus I found with those who track their FI cars...cough cough @CSG Mike, is that if you aren't changing the pistons, you aren't changing tolerances. The viscosity shouldn't change just because you turbo it, because the piston clearances don't change.

Don't keep up a great deal with Honda, but I understood that 0W16 was a 2014 model spec. Hadn't been aware that they had reversed decision since December.

Quote:

Originally Posted by cdrazic93 (Post 1746442)

The Subaru FA20T does have different pistons, they lowered the compression ratio. But the crank is the same so I don't think they would have changed clearances.