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Old 07-26-2003, 01:52 AM   #1
Irishman
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Question Amsoil, Royal Purple, or Mobile 1?

I am switching oil after my 1000 mile mark and was wondering what oil was the best to run? I have only heard great things about Royal Purple and Amsoil but am not sure if it is worth the money.
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Old 07-26-2003, 01:53 AM   #2
ciper
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Mobil 1, because you can buy it anywhere and Wal Mart has 5 quart jugs for 19$
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Old 07-26-2003, 02:03 AM   #3
LESLIEx317537
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I plan on using Mobil 1 Syn 5W-30 for my engine.

You can even run 10W-30 if your in a warmer area where it doesn't freeze.
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Old 07-26-2003, 08:10 AM   #4
ha-evolution
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Royal Purple or Red Line because they are the best. Mobil 1 is ok but why cheap out on your STi? The $20 saved per oil change is not going to add up to much over the life of the car.
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Old 07-26-2003, 08:44 AM   #5
scott_gunn
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I believe Amsoil is the absolute best. They have many performance tests of their products online. Plus, they guarantee their oil will be good for 25,000 miles.
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Old 07-26-2003, 08:49 AM   #6
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Motul is what the Rally Teams use
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Old 07-26-2003, 09:02 AM   #7
frdawg
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i use Royal purple, its only 4.98 a qt where i live
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Old 07-26-2003, 09:26 AM   #8
PunksWRX
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Porsche, BMW, Chevrolet Corvette, Mastercraft Boats and many others all come factory filled with Mobil 1 - justification to me that this oil is worthy for my beloved STi.

Punk
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Old 07-26-2003, 11:07 AM   #9
brunetmj
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This topic is of course a common one. What oil and when to switch. The only restriction I have come across suggests to wait for the 1,000 miles before switching to synthetics (as you are doing). This is to allow for piston ring break in (synthetics are to lubricating for the necessary controlled wear). My guess is that all those brands mentioned are very good and in the long run it probably makes very little difference which you choose. My preference is to change oil and filter using mineral oil at 1,000 miles and switching to synthetics at 3,000 miles. This is more for economic reasons and to assure myself that there is total break in. . I use mobile one only because it is commonly available.
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Old 07-26-2003, 11:11 AM   #10
Extraze
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Quote:
Originally posted by Sparks
Motul is what the Rally Teams use
ditto, and thats what i plan on using.
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Old 07-26-2003, 11:12 AM   #11
dmross
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Default It doesn't matter

They are all good... Redline, Mobil 1, Amsoil, Royal Purple... marketing and brand loyalty is the only difference when it comes down to it. Oh sure, one may claim they have some special ultra lube chemical etc. blah blah, but it doesn't really matter.

One day when your STi is at 150,000 miles, I guarantee you won't be saying: "Damn, I wish I used synthetic X instead of synthetic Y because it would have been 'better'"
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Old 07-26-2003, 11:16 AM   #12
LESLIEx317537
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True, I agree.

It's more important to keep the level at the marker and to change the oil frequently with the filter.

I like changing every 2500 miles after the first 1000 break in change. And as the car gets older, you may need more frequent changes.

I use Fully Synthetic.
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Old 07-26-2003, 12:18 PM   #13
scott_gunn
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If you're changing synthetic oil after 2500 miles, you're throwing away perfectly good oil.
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Old 07-26-2003, 03:14 PM   #14
LESLIEx317537
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Really?

How long can Syn run for? 4000 miles?
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Old 07-26-2003, 03:39 PM   #15
scott_gunn
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Amsoil guarantees their oil for 25,000 miles. I personally would change it before then.

Subaru's recommended oil change interval for the WRX is 7,500 miles (and that's with non-synthetic oil).
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Old 07-26-2003, 05:11 PM   #16
LESLIEx317537
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Wow really?

I'm going to change it every 5000.
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Old 07-26-2003, 05:26 PM   #17
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Quote:
Originally posted by scott_gunn
Amsoil guarantees their oil for 25,000 miles. I personally would change it before then.

Subaru's recommended oil change interval for the WRX is 7,500 miles (and that's with non-synthetic oil).
anyone know what Subaru recommend for STi??
should be in the manual...
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Old 07-26-2003, 07:32 PM   #18
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Irishman:.... Whatever you do, dont use redline or royal purple...

Redline has just recently changed their formula to save money and in doing this, their oil isnt as good as it used to be. I have a good friend that works for redline and has told me not to use it anymore.

Royal purple has a certain chemical in it (I forgot what it is) that will eat seals if used for long enough. Dont get me wrong though... Royal Purple DOES lubricate very well.


I have never used Amsoil. I also havent heard anything bad about their product.

I use Mobil1 only beacause It is sold almost everywhere and I have never had any bad experiences with it.
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Old 07-27-2003, 03:29 PM   #19
MKIVSupra
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Yeah changing synthetic oil after only 2500 miles is a waste. I used to change the Mobil 1 in my old Legacy between 4k and 5k miles. I think I am going to run Amsoil in my STi and stick to those intervals or maybe go with the 7,500 interval mentioned in the owner's manual for normal driving.
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Old 07-27-2003, 03:50 PM   #20
hyperion
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I swear to god that I'm not trolling here, but unless you live in a climate where cold starts are an issue, the best oil for your $$ is plain old cheap mineral oil. There have been many studies (just do a web search) that have shown little or no difference between petroleum-based oil and synthetics. The only advantage is that synths have lower viscosity at extremely low temps, thus giving better cold-start lubrication in cold weather.

Here is one study that bears this out:

http://www.xs11.com/stories/croil96.shtml

Performed by the universally respected Consumer Reports magazine. They used NYC cabs (ouch) as their test, 60k miles, identical engines, and really tough (stop-and-go) traffic. Here is the punch line:

"If you've been loyal to one brand, you may be surprised to learn that every oil we tested was good at doing what motor oil is supposed to do. More extensive tests, under other driving conditions, might have revealed minor differences. But thorough statistical analysis of our data showed no brand-not even the expensive synthetics-to be meaningfully better or worse in our tests."

The only way that synthetics are cheapers is by using something like Amsoil and changing at 15,000 or 30,000 mile intervals. That particular product is actually designed to be run in the car continuously with only oil filter changes every 6-12k miles.

http://www.performancemotoroil.com/Taxi_test

(I am a sucker for marketing, so I use Amsoil in my race car. )

I am not trying to discourage anyone from running premium oil in their car. However, the scientific evidence shows that doing so offers almost no benefit to modern road cars.

-ch
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Old 07-28-2003, 12:05 AM   #21
brunetmj
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Quote:
unless you live in a climate where cold starts are an issue, the best oil for your $$ is plain old cheap mineral oil.
I have heard that before from my Subaru mechanic and from other knowledgeable people. Unfortunately real and controlled experiments have never been done to the best of my knowledge. Personally I just feel more confidence using synthetics in a turbo charged car. The Turbo charger in of itself has got to beat the devil out of the oil.
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Old 07-28-2003, 01:50 AM   #22
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Castrol, GTX or Syntec 5W30.
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Old 07-28-2003, 11:07 AM   #23
slinger99
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There is absolutely no reason to change your any sooner than 5,000 miles. Take a look at who is telling you to change your oil @3,000 miles. It's not the car manufacturers, it's all the oil companies, car dealerships, Jiffy Lubes and step-dads.
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Old 07-28-2003, 01:33 PM   #24
onemoremile
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Just thought I'd chime in with some peronal experience. My 94 Jetta VR6 is my autocross car and gets flogged every weekend. It has 265,000 miles on it and sees redline pretty much every day. I do have an oil temp gauge and don't go over 4-5k until the oil hits 150 degrees. The car has run Mobil 1 since about 5k and has never had an oil change below 5k miles. It had one go about 15k and the oil still looked great. Usually I toss in a quart and change the filter every 5k and leave the old oil in. I take a few drops of new Mobil 1 and a few drops from the dipstick and put them next to each other on a sheet of inkjet paper. If they look the same then I keep the oil in there and swap filters. The car has more power than most VR6s with the same mods (chip and panel filter) and pulls strong to redline. Turbo cars will need their oil changed more frequently but not every 3k.
-Jim Tremayne
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East Imports in 49512
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Old 07-28-2003, 01:34 PM   #25
Bullit
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I've owned a 91' toyota V6 4wd truck since I drove it off the lot w/ 24 miles on it. I put Castrol Syntec in it the first oil change and have been using it ever since. I change my oil religiously every 10,000 miles. I know it's not a turbo charged engine but I've been driving the hell out of it since day one. It got its first scratch (all the way up the hood and to the metal) at about the 150 mile mark and it was because I was doing some serious four wheeling. It was used as a delivery truck for the first three years of its life. I even towed an International Scout full of books, a bed and a desk from Denver to Tulsa. It has over 150,000 miles on it and with the exception of a little sloppy steering (I still haven't replaced the leaky steering box) the thing still keeps running and running well I might add. When i got it emission tested a few months ago it didn't register any emissions at all! I still have that truck and will never sell it.

I use AMSOIL in my WRX (soon too be STi) and change the oil every 6 months, which probably only equates to 5000 miles an oil change.

My point...
Buy what ever oil gives you the piece of mind you need. My friend's dad is a lubrication engineer and even he agrees that the oil with the newest formula is normally the best (be it synth or mineral), unless the new formula was made to lower the price then buyer beware. Don't change it too often though. Slinger99 is right, you don't need to change your oil any sooner than 5000 miles unless you own stock in the oil industry.
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