Best Oil for turbo engine.
 

Just curious what everyone is running for the engine oil on their Turbo builds.

Amsoil Signature 0w20 currently.

I am using 5W30 Motul 300V.

Motul 8100 0w30

Running royal purple 5w30 (I know but it's all the parts store had at the time)

one that comes in a jug that says 0w20

/thread

Taking no chances under racing conditions so I'm running Redline 40w Race which is a 10w40. While it might sap some HP oil temps are so high while racing, oil pressure drops, and a heavier oil will do a better job of maintaining oil pressure at high rpm.

Also do not forget the more power you make the more critical the oil wedge in your bearings becomes.

Phil Grabow

Subaru's Idemitsu 5w30

i'm running amsoil 5w30

What is your thoughts about a 40w on stock bearing clearances? My fear with a 40w was it would be a bit too thick. I value your opinion.

Looks like it varies, i was thinking a good 5-30 synthetic.

I'm running 5w-30

Currently 5w30, next change is to GC 0w30

5w30 full synthetic, 10w40 for racing use. The idea that bearing clearances are tighter now than the days when oem's like Subaru recommended running 20w50 in their turbo engines is a myth. Clearances haven't changed but CAFE standards have. 0w20 is used for improved fuel economy, at the expense of engine protection and longevity.

A lot of the turbo Subaru guys (including myself) use Rotella t6 5w40 with really great results. Not sure if that would be too think for the FA engines or not but if you're pushing boost, I would think you would be ok. Whatever you use I would recommend doing some UOAs to get an idea of how well the oil you choose is holding up for your setup.

It's a compromise really but we know the motor was designed for 0-20w but we know that is primarily for fuel efficiency and maximum HP given relatively low power. Now I know the oil temps we see on our STi and others have noted 270F on stock FRS/BRZ on track so my primary concern was to deal with the high temp and how that relates to viscosity. .

Now synthetic oils are so much more high tech than they used to be an even these 40w race oils flow like a 10w so I wasn't concerned so much as I was aware of some possible negatives. Oil pressure loss has been observed at high rpm on track cars, the bearings are pretty thin so pressure requirements will be high, I'm running an oil cooled and journal bearing turbocharger, so all that added up to my decision.

It's warm right now so honestly I haven't observed any side effects at all, and if anything I no longer hear clanky metalic sounds at start up anymore. No doubt this will sap some NA power so those guys might be better off with 5w40.

Hope that helps and so far my FRS has taken serious bosted track abuse!

Thanks,
Phil Grabow

AMSoil full synthetic 5w30

AMSoil full synthetic 5w30

Sorry to revive an old thread.

I was wondering if any of you have a new opinion on the oil you were using a year ago, or a change of heart, anything really :P

amsoil 10w30 dominator if you don't have cats and run e85 signature series otherwise

I'm using Motul 300v 0w20. I think I'm going to try 30w on the next oil change. Oil pressures get kinda low at the track

Hit the nail right on the head.

Mobil 1 05w-30 here w/ Liqui Moly (3721) Cera Tec Friction Modifier.
Following oil changes would be Mobil 1 05w-30 with Liqui Moly 2009 Anti-Friction Oil Treatment .

WILL be running 05w30 Amsoil Synthetic

I was told it a heavier oil than 0/20w would interfere with the variable cam timing as it reduces the ability to make adjustments quick enough with a higher viscosity so don't use it . :iono:

Then why does Subaru recommend 5w30 in the owners manual and put 5w30 in the fa20dit that has the same cams and clearances?

The manual also states 5-30 can also be used.

We have tried several different grades of oil. All Motul.
H Tech 0w20
H Tech 5w30
300v 0w20
300v 5w30

After analysing all, we now run 300v 5w30 in both NA and turbo applications.

Our results mimick Toyota Racing NZ, who run 5w30 in the TR86 race cars.

Stick with 0w20 if your car is mostly a street vehicle, and is NA. It will provide marginally better fuel economy. Which is essentially why it is the factory fill weight.

Will check the manual but I was sure it said 5/30 could be used if 0/20 wasn't
available but to change it out asap.

Anyone know anything about United oils full synthetic 0/30w API SN with a
viscosity index of 162 as I can get this at a very good price but don't know
anybody who uses it here.

Mine is now supercharged so hence my interest.

the manual states

Page 382 of the Australian delivered owners manual Pn# OM18023E

Yup this has been covered many times

I have been running 0w30 on my FI for some time but I am seeing a lot of people running 5w30 on here with their turbos. I'm glad to see someone who has tested a few different kinds post. You said you analyzed all the weights I am just curious what deciding factors you utilized in order to make the switch to 5w30. Was it individually oil temp or oil pressure under heavy loads? was it the combination of the two? Did you actually notice a difference in fuel economy at all? not that for me its a concern but maybe others would like to know. Were you running 91 octane or E85 during your tests? did you do cold start tests as well and have any noticeable differences on cold mornings? just a few questions.. and if anyone else has conducted actual side by side comparison tests I would love to hear their results.

I abslolutely second this.

I would love to see the nitty gritty details of your testing!

Seriously, I am extremely curious.

Torco SR-1r 10W30 for me.

No issues so far

0w20 Eneos Sustina

Looks as if I'm the only one

Running Eneos 0w20 at the moment.
I will need to change my oil soon and I might stick with the same oil.

5w30 amsoil.

I've been running castrol 5w30 for probabaly 10 months now boosted on e85 with no oil cooler. When my built short block goes in and the power goes up I'll be running brad penn 5w30 for the break in 500 miles, then red line 5w30 from there out. I will be adding an oil cooler as well at that point

Brad penn specifically says not to use their oil with e85 on their website. @spitfire481 making sure you saw this

http://www.bobistheoilguy.com/motor-oil-201/

0w20-40 based on oil pressure. You want 10psi per 1000rpm. There is no reason to use anything with a thicker cold rating than 0, other than cost. All oils are too thick to lubricate engines effectively until they reach operating temperature.