Best Oil for turbo engine.

[robotvoice]

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.

[Element Tuning]

Originally Posted by No Limit Motorsport

What is your thoughts about a 40w on stock bearing clearances? My fear with Oil pressure loss is apparent even in NA for at high RPMOil pressure loss is apparent even in NA for at high RPM 40w was it would be a bit too thick. I value your opinion.

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

[Nothing]

AMSoil full synthetic 5w30

[Fabron757]

AMSoil full synthetic 5w30

[Kuros]

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

[Reaper]

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

[protpibe]

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

[Dream20b]

Originally Posted by Element Tuning

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

Phil Grabow

Hit the nail right on the head.

[zoth]

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 .

[ThisGuy919]

WILL be running 05w30 Amsoil Synthetic

[sam69]

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 .

[Reaper]

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

[zoth]

Originally Posted by sam69

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 .

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

[Manji]

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.