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Old 01-25-2009, 12:51 PM   #1
Impreza911
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Default Castrol Syntec or Valvoline?

So any thoughts on some of the more available synthetic oils? I have a stock 02 rex with 120k on it. Engine oil analysis shows higher than normal wear (iron, brass etc). The car has always had Valvoline synthetic at a short interval (7000k or so).

I've heard good things about Castrol Syntec, not much about valvoline. Any thoughts about which way to go. Or even perhaps switch to a dino oil and use a short interval to flush out any increased wear regularly.

Also, are there good alternatives to the stock filters? k&n? others?
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Old 01-25-2009, 01:30 PM   #2
clsmooth
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I found Catrols Syntec burns off the least for me. And I like us to either OEM or K&N oil filters (whichever's cheaper at the time...)
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Old 01-25-2009, 01:57 PM   #3
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I'm running syntec now, tried Mobil 1 once and my car drank it. I've used valvoline in the past and it was fine as well.
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Old 01-25-2009, 11:47 PM   #4
alcoolaid
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7000km isn't really short imo... I've used RP in all my cars... it's good, relatively cheap too. I find M1 is too thin. Burns off way too easy.

As for air filters... K&N panel filter.
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Old 01-26-2009, 12:25 AM   #5
alan ling
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Quaker State synthetic is not too bad. Use it in my wife's wagon. I also use the Castrol synthetic if I can't get the Quaker State. Royal Purple is all my STi gets. Getting 5 litres tomorrow in fact. Unless I am lazy and decide to do something else.
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Old 01-26-2009, 01:07 AM   #6
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I'd used valvone synpower on my 02' wrx since day 1 and it ran perfect till the day I sold it. No consumption at all. However, on my other cars, I've switched between different synthetic to dino. But I used Purolator filters.

If u're burning a bit, try some european formula which has a higher TBN and can sustain higher shear/stress (>3.5). I've run mobil 1 0W40 euro formula, pennzoil 5W40 euro (dealer oil).
Or simply try some syntec 5W40 or even mobil 1 5W50. I can tell that u're even on bitog...
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Old 01-27-2009, 10:14 PM   #7
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Quote:
Originally Posted by alan ling View Post
Quaker State synthetic is not too bad. Use it in my wife's wagon. I also use the Castrol synthetic if I can't get the Quaker State. Royal Purple is all my STi gets. Getting 5 litres tomorrow in fact. Unless I am lazy and decide to do something else.
Before you buy that oil, read what's on the back of the bottle. It states that the API recommends SL rated oils for 2004 and previous vehicles. The current API rating is SM and has been since late 2004 when it replaced the old API SL rating. RP is old API SL rated in 5W-20, 5W-30 and 10W-30. Even low priced Wal Mart Tech 2000 oil is API SM rated, better than RP.
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Old 01-27-2009, 11:40 PM   #8
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I run Syntec because Costco sells it cheap. $35 for a 6 litres.
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Old 01-28-2009, 01:24 AM   #9
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Quote:
Originally Posted by timbits View Post
I run Syntec because Costco sells it cheap. $35 for a 6 litres.
So cheap oil is what you're after? I'm not flaming you at all, so please don't misunderstand.

If you would like to maybe re-evaluate the criteria you are using to select an oil, call a Subaru dealers parts department and ask them how much a new engine is. Hold on to your hair!

Oil is the very lifeblood of an engine and is the single most important choice we can make for that engine. If I may suggest, look for performance, not price and in the long run, you will save money. If you're trading in the car tomorrow, then be really cheap and don't change the oil at all. But if you're going to be keeping your car a while and you want that engine to run, "like new", for a longer period of time, delivering more power and better fuel ecomomy for you, an oil chosen for it's performance and protection abilities can save you a lot of money.

Good luck with it and have a super day!
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Old 01-28-2009, 01:45 PM   #10
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Quote:
Originally Posted by HiTechOilCo View Post
So cheap oil is what you're after? I'm not flaming you at all, so please don't misunderstand.
Yes, but not really... Allow me to explain.

If cheap oil is what I'm after, then there are lots of cheaper, house-brand dino oils available. I've used them before in a pinch, and my engine's never blown up because of them.

Let's look at this philisophically. No matter how much research one does, or how many hours one spends arguing the pros and cons of different motor oils over the internet, the physics inside your engine don't change: Metal bits rub together in there and they need lubrication.

The car comes from the factory with dino oil in it and according to the engineers, that's good enough. Now, I happen to agree with them. How many folks out there drive subaru's and just do the minimum required service (dino oil, every 6000km's or more depending on their personal schedules) on their vehicles? I'd say we (those of us who take really good care of our cars) make up the top 20% of car owners, if that. How many of the other 80% of users do you suppose have ever experienced engine failure due to improper lubrication?

Some argue that they "drive harder than the average user" and while that may be true in a very small number of cases, most of us do, just use our cars as daily drivers. Except we warm them up for 15 seconds or so before driving off. And we drive gently for the first few minutes. And we rev-match our downshifts. And we don't ride our brakes going down hills... All those techniques are used to baby your car; to avoid unnecessary wear. The average user probably doesn't know about any of that stuff. So who's really harder on their equipment?

Getting back to engine oil. There's no arguing that synthetic is way better than dino. It doesn't break down, flows well when the engine's cold, offers small improvements in fuels economy, and really does protect a lot better. By choosing synthetic, you're already way ahead of the baby curve.

The rest is economics: Where do I find the cheapest, reputable bottle of synthetic oil...? Costco. $35 for 6 litres of syntec.

Last edited by timbits; 01-28-2009 at 01:53 PM.
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Old 01-28-2009, 06:54 PM   #11
alcoolaid
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Quote:
Originally Posted by HiTechOilCo View Post
Before you buy that oil, read what's on the back of the bottle. It states that the API recommends SL rated oils for 2004 and previous vehicles. The current API rating is SM and has been since late 2004 when it replaced the old API SL rating. RP is old API SL rated in 5W-20, 5W-30 and 10W-30. Even low priced Wal Mart Tech 2000 oil is API SM rated, better than RP.
It's not about the ratings. It's about the results.
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Old 01-28-2009, 07:11 PM   #12
Sooksook
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I've used both brands for numerous oil changes and have never had problems. Change religiously every 6k. Valvoline is cheap at Wal Mart and Castrol at Costco
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Old 01-28-2009, 07:26 PM   #13
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Valvoline 5W40 please...
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Old 01-28-2009, 09:30 PM   #14
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Quote:
Originally Posted by Impreza911 View Post
The car has always had Valvoline synthetic at a short interval (7000k or so).
7000km is not a short interval Subaru recommends 3750 miles/6000km for turbo engines, and I treat my NA engine the same way. I'm not as picky on brand, but it's always synthetic 5W30, and not Mobil 1
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Old 01-28-2009, 09:41 PM   #15
bwco
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7000 km is nothing for quality synthetic oil.
Count the TBN for Castrol syntec 5W40 vs Valvoline synpower 5W40
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Old 01-28-2009, 09:44 PM   #16
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Quote:
Originally Posted by bwco View Post
7000 km is nothing for quality synthetic oil.
But longer than Subaru recommends, don't forget about that warranty!
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Old 03-10-2009, 11:05 AM   #17
fulltimeW.O.T.
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I've been using castrol syntec 5w40, no complaints so far.


From recent research i've been doing, I'm thinking about giving Shell Rotella T 5w40 a shot. Im not sure tho, kinda scares me to put diesel motor oil in my brand new 2009. Can anyone chime-in on this? Is it still safe to run rotella T in newer WRX's?

Last edited by fulltimeW.O.T.; 03-10-2009 at 11:22 AM.
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Old 03-10-2009, 11:18 AM   #18
JDM 3SGTE
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Quote:
Originally Posted by timbits View Post
Where do I find the cheapest, reputable bottle of synthetic oil...? Costco. $35 for 6 litres of syntec.
just fyi, syntec is not a synthetic oil. only the 0w30 german castrol is a true synthetic.
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Old 03-10-2009, 12:13 PM   #19
kgb
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Last I checked Walmart still carries German Castrol (0W30 made in Germany) so I got some for this round of oil change
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Old 03-10-2009, 03:18 PM   #20
alcoolaid
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I've been trying to find some 5w40 Rotella T as well. I know some VIC members use it... where can I find some locally?
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Old 03-10-2009, 03:21 PM   #21
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i've been using castrol on all my cars,so i'd go with castrol
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Old 03-10-2009, 04:01 PM   #22
bikergreen
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I am having good luck with castol so far but have only had my rex for 5 months..

I need to do an oil analysis.. what is the company/web site that does it?? can't remember

Cheers
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Old 03-11-2009, 01:05 AM   #23
shawmacs
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Pennzoil 5w30 is what I use. Doesn't burn off hardly at all
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Old 03-11-2009, 10:07 AM   #24
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Quote:
Originally Posted by kgb View Post
Last I checked Walmart still carries German Castrol (0W30 made in Germany) so I got some for this round of oil change
+1. GC 0w-30 is good stuff! Use it all year long and change my oil every *5,000 MILES!



















*And no, I really don't care what your opinion is on me changing my oil every 5,000 miles! I've done my research and if you disagree with it, so be it, but I would recommend you do some MORE research yourself!
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Old 03-11-2009, 10:14 AM   #25
fulltimeW.O.T.
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my walmart discontinued carrying german castrol
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