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Old 03-28-2008, 10:22 PM   #1
Tony_Montana87
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Default 5w-40?

Whats goin on guys. Im coming up to 20k miles and its time for a oil change, i change every 5kmiles. Since the heat is coming up in socal i wanna get a littler thicker oil for protection. Im assuming 5w-40 is better and thicker then 5w-30. What weight are you guys running in hot weather?
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Old 03-28-2008, 11:26 PM   #2
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Quote:
Originally Posted by Tony_Montana87 View Post
Whats goin on guys. Im coming up to 20k miles and its time for a oil change, i change every 5kmiles. Since the heat is coming up in socal i wanna get a littler thicker oil for protection. Im assuming 5w-40 is better and thicker then 5w-30. What weight are you guys running in hot weather?
perfect
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Old 03-28-2008, 11:27 PM   #3
Tony_Montana87
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thanks buddy. Ur kool. after reading through the forums i think im goin to try Rotella
5w-40
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Old 03-29-2008, 10:15 AM   #4
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15w-40
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Old 03-29-2008, 01:01 PM   #5
k mier
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Rotella makes a synthetic 5w-40.
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Old 03-29-2008, 01:44 PM   #6
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Yesssssssssssss??? Go To Wally_world.
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Old 03-29-2008, 01:54 PM   #7
Tony_Montana87
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i was thinking about using 15w-40 but i thinks its overkill and too thick for my STi, its only got CAI, and Catback exhaust and HKS BOV, so im not pushing to much power but still i want to be safe in summer heat. It gets hot here in Southern California.

Heres my pics of what i bought last night. But i forgot to pick up an oil filter! Damn! What are you guys using? Do Subarus have the optional large filter? I know my VW did.



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Old 03-29-2008, 01:55 PM   #8
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Just about all 5 Qts are goin in. From what i read on the Corrected Full capacity of the 04 STI. Thanks guys for watching! O and what filter should i buy?
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Old 03-29-2008, 03:34 PM   #9
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Quote:
Originally Posted by Tony_Montana87 View Post
O and what filter should i buy?
You can't go wrong with oem subaru oil filter.

http://www.thekingofparts.com/servlet/Detail?no=42

Other options are Mobil one, Purolator PureONE.
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Old 03-30-2008, 12:24 AM   #10
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Amsoil is the best choice for filtration and flow. M1/K&N are second, and OEM is very good.
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Old 03-30-2008, 01:04 PM   #11
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ill go with amsoil for the filter then. Where are they sold? Autozone? Kragen? Pepboys?
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Old 03-30-2008, 02:37 PM   #12
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Normally you'd look in the yellow pages under oils, lubricants and look for an Amsoil dealer. Don't know wether there's a way on their website to find local dealers or not.
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Old 03-30-2008, 04:18 PM   #13
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Old 03-31-2008, 12:13 AM   #14
Tony_Montana87
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so im gussing amsoil isnt stocked in retail stores? Whats good that i can find near buy?
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Old 03-31-2008, 09:08 AM   #15
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Quote:
Originally Posted by Tony_Montana87 View Post
so im gussing amsoil isnt stocked in retail stores? Whats good that i can find near buy?
Just go to Amsoil's website and order it and they will deliver it to your house in 3-5 days.
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Old 03-31-2008, 10:05 AM   #16
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I use K&N oil filters religiously....never had a problem, and are quality products.
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Old 03-31-2008, 12:15 PM   #17
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Quote:
Originally Posted by bulwnkl View Post
Amsoil is the best choice for filtration and flow. M1/K&N are second, and OEM is very good.
yes amsoil thats all i run i have a commercial account so get a filter for like $5 and oil forless 7500 mile oil 5w40 also comes in a DIESEL formula so watch out what u buy i ran 0w30 throu winter its a 1year 30k oil all u change is oil filter and top off ran like a champ. if ur in chicago pm me for oil prices
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Old 03-31-2008, 01:27 PM   #18
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You should bump your oil change interval up to 300-4000 miles. According to my recent used oil analysis (UOA), my Red Line 10w30 could go another 1k easy.

15w40 is a horrible choice for a turbo'ed engine. The first number only applies to startup, when the oil is cold, so you want to maintain a low number for a daily driven car. A /40 weight is a great choice for these engines...it is almost a requirement in warmer climates.

As for the brand, I have not seen any UOAs for it, so I cannot tell you whether it is any good or not.
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Old 03-31-2008, 01:34 PM   #19
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Amsoil filters are actually more likely to blow out and bypass than M1, pureONE, K&N. I have a huge Amsoil dealer on record saying that he prefers pureONE or M1 filters to the Amsoil due to the fragile nature of the Amsoil units.
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Old 03-31-2008, 02:25 PM   #20
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No, Amsoil filters are not more likely to blow out OR bypass than the others you mention. They will bypass less and blow out the same or less than an M1/K&N. The PureONEs are excellent filters, but bypass much more than is optimal until the oil gets warm. As I said earlier, M1/K&N are about second. PureONEs are an excellent solution for long-drive conditions. Very short trips cause it to bypass too much.

Perhaps your Amsoil dealer was talking about the older filters? The new EaO filters are outstanding. Another alternative is that your dealer doesn't know what he's talking about...

Last edited by bulwnkl; 03-31-2008 at 02:45 PM.
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Old 03-31-2008, 04:15 PM   #21
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Napa Nascar select oil filters are good. Look at my UOA silicon level using this filter and cheap oil. The napa nascar select filters flows the oil differently to stop oil flow turbulence in comparison to normal oil filters.

http://forums.nasioc.com/forums/show...php?p=21062562

Im sure most of it is via good air filtration but still.
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Old 04-01-2008, 02:17 PM   #22
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Quote:
Originally Posted by bulwnkl View Post
Perhaps your Amsoil dealer was talking about the older filters? The new EaO filters are outstanding. Another alternative is that your dealer doesn't know what he's talking about...
Sorry it was in respect to Wix filters, but in any case the dealer is the largest Amsoil vendor for the Evo community. He knows his ****, I have no doubt about it. Heres a snippet...

Quote:
Originally Posted by Oil Doc
I usually recommend the WIX filter over the AMSOIL filter, as most EVO owners either run them hard on the Street, or Track their cars frequently, and the WIX filter will have less of a chance of going into by-pass.

I am working up some 1 Micron Filter Kits to help keep the oil analytically clean and not going into bypass, plus adding HP due to less restriction.
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Old 04-01-2008, 03:28 PM   #23
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We have been using the EA filters for a while now. No blow outs, or by pass issues.

Not just in the WRX, but in our Suburban 3/4 ton shop truck, our 3 rd gen Camaro ESP car, not to mention many customer cars. Perhaps an Evo thing? The Wix filters are very good as well, as a lower price alternative.

FYI, we are a Amsoil dealer.

Bryan
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Old 04-01-2008, 05:54 PM   #24
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Tony, you should run the Rotella 5w40 synth year-round. The turbo subarus really do need a more robust oil than a 5w30. Notice in the manual that the lightest oil 'allowed' is 5w30, and that outside temps only need to be at 0 degrees F to allow the use of 10w40.

The 5w40 will cover you during your hottest summer and if you ever go up to Bear in the winter.

Also, the OEM Subaru filter is, IMO, the best choice. The main reason being the bypass valve spring tension level. While their may be some filters out there with slightly better flow and/or filtration, I don't know that any of them have the combination of great build quality, filtration, and flow, and have the proper bypass valve spring level (which, from my research, was a big factor in many long-term motor issues).

Don't take my word for it though:

http://forums.nasioc.com/forums/show...oem+oil+filter
http://www.bescaredracing.com/sti/oil/filters/compare/

Last edited by shemoves; 04-01-2008 at 06:06 PM.
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Old 04-01-2008, 07:21 PM   #25
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Be glad that a very good 5w-40 is available everywhere and is so cheap (Rotella Syn).

I just got done doing an oil change in a buddy's '01 Porsche Boxter track car.

10 qts Mobil 1 15w-50 Extended performance = $75.31
1 x Porsche OEM cartridge filter = $10.00

That's a bit of cash for only 3-5K miles of use, but this is the 2nd engine in the car...former owner experimented with Royal Purple 10w-40 and popped the engine right away, catastrophic oil-related failures on teardown (not long-term wear)
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