Amsoil ASL 5W30 or Mobil EP 5W30 on Legacy GT

[darkmagician]

Hi all

Which above oil will perform better on a 2.0 Legacy GT under severe driving condition (eg. tropical climate, lots of start stop driving etc)?

 

[CharBaby]

Either I assume. Both oils are held in high reguard here at BOB's. Each oil has it's fan base.

 

[Pablo]

What year? How many miles on the engine? How long OCI?

 

[hate2work]

Either oil would work for you. Which is easier for you to get?

One thing to consider is that we know the ASL is a group IV oil, the Mobil

If you wanted a group IV oil that's a tad thicker at operating temps, take a look at German Castrol.

 

[buster]

Both are great and probably very similar in quality. Oil consumption may be lower with the Amsoil. I don't think it's provable, based on how many people use M1, but it seems consumption is higher in Sub's with M1 then other oils.

Mobil 1 will handle the heat and deposits like a champ though.

 

[DragRace]

I've used the ASL Amsoil with good results.

You just need to decide if it's easier to use the mobil 1 as you dont need to order it.Either way,both good oils to pick from.

 

[sparkplug]

Why not RTS 5w40? Subies like 40 weight for some reason.

 

[buster]

Subies do seem to like 40 grade oils, whatever the means. LOL. M1 0w40 or Rotella would be good choices too.

 

[Gary Allan]

If I recall correctly Soob turbo's beat the tar out of the oil ..but it doesn't seem to mean much in our "can't be counted as wear depending on who/how your reading it" UOA. Don't they have some silly short OCI ..one that thinks Subaru sent you back to 1965?

The compensatory reaction is to go heavier.

 

[darkmagician]

Originally Posted By: Pablo
What year? How many miles on the engine? How long OCI?


The car is manufactured in 2005 with 85,000km (53,000 miles)on the engine. The car is a used one so I'm not sure the OCI by the previous owner. My OCI is likely to be every 10,000km (or 3,000 miles)

 

[darkmagician]

Originally Posted By: hate2work

Either oil would work for you. Which is easier for you to get?

One thing to consider is that we know the ASL is a group IV oil, the Mobil

If you wanted a group IV oil that's a tad thicker at operating temps, take a look at German Castrol.


Both oils should be avaliable here. Is German Castrol a 40 oil?

 

[darkmagician]

Originally Posted By: sparkplug
Why not RTS 5w40? Subies like 40 weight for some reason.


My friends who are driving subaru turbocharged cars recommended 40 weight oil too. The reason was that tropical climate should use thicker oil for better protection.

But I was thinking of following the manual recommendation of 5w30 instead.

 

[steve20]

3000 mile oil changes with synthetic?? what planet are you from, dude?

Steve

 

[Billy_D]

For a 3K OCI use Mobil 5000. Use Mobil EP or Amsoil ASL if you plan to extend your OCI.

 

[ThirdeYe]

10,000km is not 3,000 miles... perhaps it was a typo. Even I would run synthetic longer than 3,000 miles and I'm typically very conservative due to my itchy wrenching hand.

 

[darkmagician]

Originally Posted By: steve20
3000 mile oil changes with synthetic?? what planet are you from, dude?

Steve


Hi, typo error. It should be 6000 miles

 

[Thingfish]

I put Amsoil ACD in a lot of Turbo 2.0 subies. Works very well.

 

[Lorenzo]

Originally Posted By: darkmagician
But I was thinking of following the manual recommendation of 5w30 instead.
Take a more careful look at the owners manual.

 

[darkmagician]

Originally Posted By: Lorenzo
Originally Posted By: darkmagician
But I was thinking of following the manual recommendation of 5w30 instead.
Take a more careful look at the owners manual.


10w30, 10w40 and the recommended rating 5w30 was mentioned in the manual.

 

[Lorenzo]

OK, I suppose I meant read it carefully and completely. My fault for not being clear.

In your first post you describe your usage as severe service. In the owner manual for my '02 WRX with the same engine as yours, it recommends up to 20w50 for severe service. I assume your Legacy manual has similar recommendation.

Originally Posted By: 2002 WRX Manual
SAE viscosity number and applicable
temperature
1) 5W-30, SAE 5W-30 preferred
2) 10W-30, 10W-40
Recommended grade and viscosity
under severe driving conditions
If the vehicle is used in desert areas, in areas with
very high temperatures, or used for heavy-duty applications
such as a towing a trailer, use of oil with
the following grade and viscosities is recommended.
API classification SJ or SH:
SAE viscosity No.: 30, 40, 10W-50, 20W-40,
20W-50