Safe to run 5w-30 oil?

[smbrm]

Originally Posted by bluesubie

A nominate you to do a uoa every 1,000 miles, for a range of different muti-viscosity oils, to see if the viscosity changes. .

-Dennis

I'll leave that to you newby enthusiasts as a learning exercise. I've probably forgotten about more UOA's than most of you will ever see!

[jdmasfcuk]

[BoostedWrbBrz]

i run 0W-30

[supramkivtt2jz]

Originally Posted by ayau

Someone needs to verify this but...

I believe 0w-20 and 0w-30 will still have different room temperature viscositities. 0w-20 should be thinner at room temperature, therefore, will be "better" for your engine at startup.

Bobistheoilguy.com stresses that no matter what oil you put into your engine, it's still too thick at room temperature.

I think it's safe to assume that Subaru has the most knowledge about their own engine. If they recommend 0w-20, then you should stick to that under normal driving conditions. The only exception would be if your oil temperature runs very hot due to tracking the car (very low population), then you may want to consider 5w-30 to reduce shearing.

correct, ALL oil is too viscous at ambient temperature. 0-20 does have a lower VI than 0-30, but he also stressed that the weight of oil used should be dependent upon pressure and flow and that, essentially, at racing temperatures, all oil has the same viscosity.

if an oil pump only allows 50 psi max and both the 0-20 and 0-30 flow 50 psi at 7000 rpm, the 0-20 should have a higher flow rate and cool more effectively because of the lower viscosity.

his entire education series was really insightful. I would love to be in a position to test flow rates and viscosities for myself.

[Big-B]

2013 Toyota Pro / Celebrity Scion FR-S Specifications

ENGINE
Type 4-cylinder, boxer type, 16-valve DOHC with Variable Valve Timing Control
Displacement 2.0L (121.9 Cu. In.)
Power 210 hp @ 7000 rpm
Induction Fuel Injection D-4S (Direct and Port Injection System) TRD Performance Air Intake
Bore X Stroke 86.0 mm X 86.0mm
Compression Ratio 12.5:1
Fuel F&L racing fuel 100 octane unleaded
Exhaust TRD stainless-steel exhaust
Motor Oil Redline 0W20 synthetic

Toyota is using 0W-20 in their track car, I would trust them on this decision.

[Huehuecoyotl]

Originally Posted by ayau

Someone needs to verify this but...

I believe 0w-20 and 0w-30 will still have different room temperature viscositities. 0w-20 should be thinner at room temperature, therefore, will be "better" for your engine at startup.

Bobistheoilguy.com stresses that no matter what oil you put into your engine, it's still too thick at room temperature.

I think it's safe to assume that Subaru has the most knowledge about their own engine. If they recommend 0w-20, then you should stick to that under normal driving conditions. The only exception would be if your oil temperature runs very hot due to tracking the car (very low population), then you may want to consider 0w-30 to reduce shearing.

dude,
youre making too much sense and I could not agree with you more,
fixed the post above, Not sure there is a case for a thicker startup viscosity
thank you btw for your posts, love them all
I run may run a 50/50 mix of 0w20 and 0w30 just to benefit a slightly better HTHS when temps are over 100F ambient
I see no reason to go to a 5W, if a 0w-30 offers similar chemistry

[Dave-ROR]

Originally Posted by Huehuecoyotl

dude,
youre making too much sense and I could not agree with you more,
fixed the post above, Not sure there is a case for a thicker startup viscosity
thank you btw for your posts, love them all
I run may run a 50/50 mix of 0w20 and 0w30 just to benefit a slightly better HTHS when temps are over 100F ambient
I see no reason to go to a 5W, if a 0w-30 offers similar chemistry

Simple, because 0W-30 isn't offered in your preferred synth oil but 5W-30 is

For a track car I wouldn't touch 0W-20 after the pressure readings I had. Currently using 5W-30. I've been toying with the idea of setting up a pre-oiling system, but I'm lazy so I probably won't.

[Huehuecoyotl]

Originally Posted by Dave-ROR

Simple, because 0W-30 isn't offered in your preferred synth oil but 5W-30 is

For a track car I wouldn't touch 0W-20 after the pressure readings I had. Currently using 5W-30. I've been toying with the idea of setting up a pre-oiling system, but I'm lazy so I probably won't.

Thanks, great feedback D-ror

I've been on the factory stuff, and sustina on the 0w20, seems like some of the better 0w20 out there

aside from my preferred German castrol 0w30(I could be wrong but I thought this was a group3/4mixed synth but I could be wrong havent read up on it in a while), what flavor of synth 5w30 are you pouring into yours?

[mswhong]

If you guys are worried about 5w-30 being too viscous at low engine temps.. why not warm your engine up before driving off? I mean, isn't that what most people do on cold days?

[Dave-ROR]

Originally Posted by Huehuecoyotl

Thanks, great feedback D-ror

I've been on the factory stuff, and sustina on the 0w20, seems like some of the better 0w20 out there

aside from my preferred German castrol 0w30(I could be wrong but I thought this was a group3/4mixed synth but I could be wrong havent read up on it in a while), what flavor of synth 5w30 are you pouring into yours?

Currently M1/RP, trying to locate a local supply of Motul 300V to test with. I can easily get Amsoil and use to long ago, I want to do some UOAs with a few different oils.. goes back to that lazy thing though.

[reeves]

Originally Posted by ayau

Someone needs to verify this but...

I believe 0w-20 and 0w-30 will still have different room temperature viscositities. 0w-20 should be thinner at room temperature, therefore, will be "better" for your engine at startup.

Indeed, Amsoil lists their 0w-30 with a different viscosity then their 0w-20 at 40 degrees Celcius..

Originally Posted by ayau

The only exception would be if your oil temperature runs very hot due to tracking the car (very low population), then you may want to consider 5w-30 to reduce shearing.

At what oil temps is it considered "very hot"? Cruising at ~85mph, I notice my oil temps hovering around 220 degrees Fahrenheit (according to Torque Pro app).. wondering if that's enough to use 0w-30 on those trips.?

[Huehuecoyotl]

thicker oil wil make you run hotter...

[Dave-ROR]

Originally Posted by reeves

Indeed, Amsoil lists their 0w-30 with a different viscosity then their 0w-20 at 40 degrees Celcius..


At what oil temps is it considered "very hot"? Cruising at ~85mph, I notice my oil temps hovering around 220 degrees Fahrenheit (according to Torque Pro app).. wondering if that's enough to use 0w-30 on those trips.?

I personally wouldn't worry about 220 degrees...

[WWFT86]

Check out this link from Subaru Japan's website. Some Google translate may be needed if you don't read Japanese
http://www.subaru.jp/accessory/engine_oil/engine_oil/

and out of all these options it seems this 0W-30 is the bet all-around (e.g. cold weather starts, high temperature engine protection, bumper to bumper stop and go traffic), and lists BRZ specifically listed as a suitable car:
http://www.subaru.jp/accessory/engin...miumoil01.html