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Old 08-20-2003, 09:57 PM   #1
2k2
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Default Fluid Changes... are these choices good? please help I am changing them tommorow morn

Hey guys, I am changing all of my fluids tommorow morning for my 30 k mile service and I need to know if I made the right choices in buying fluids.

Coolant: Prestone Green Coolant and Distilled Water
Manual Tranny Fluid: Valvoline 80 w 90 High Performance NON synthetic
Rear Diff Fluid: Mobil 1 75w90 Synthetic fluid

Changed my oil with mobil 1 already and I dont think I am doing my brake fluid cause I dont know how to do that and don't have the time to learn right now.

So I need your advice... is there anything else I should do for 30 k mile service?

I already bought new brake pads, Axxis Ultimates and I change my oil every 3 k or so with mobil 1 synthetic.

To change my coolant do I ust look for a little plug on the bottom of the radiator, then open it then pour water in somewhere and run the engine to flush all of the coolant then put a 50/50 mix of coolant/distilled water in somewhere?

To change my rear diff fluid its easy right? Open top plug, open bottom plug, catch all of the fluild, put bottom plug in and put fluid in.

How much does the rear diff hold?

For the Manual Tranny where is the plug? I havnt looked yet but I just wanna know for reference. I know the pour spout is almost under the TMIC, I have a long neck funnel to get the fluid in without taking that out.

Any advice is helpful before tommorow morning.

Bryan
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Old 08-21-2003, 08:41 AM   #2
GQ
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I wouldn't use Prestone coolant in your car. I believe the coolant needs to be Phosphates and silicate free. Try to get the Subaru Coolant. A flush probably isn't really required. Just drain the old out at the bottom of the radiator and refill.
To change the rear differential fluid is easy. Use .7 qt, or just fill until the fluid leaks out of the fill hole. You might want to go pick up long hose, and funnel(depending on the gear oil container spout). If the gear oil container has the pointy nose, just cut the tip off and push a hose over the nose. Run the hose to the top filler hole and fill.
The transmission drain plug on my car is right at the bottom of the transmission. A shiney metal plug that I think was 21 or 22mm.
Rob
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Old 08-21-2003, 08:59 AM   #3
TimStevens
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I wouldn't use Prestone coolant either. Hit your local Subaru garage and get one or two bottles of coolant. One should be enough, but it never hurts to have extra. The drain bolt is kinda hard to see, obscured by a cross-member, but when you open it be prepared for coolant to splash all over the place. Also, you can't just fill the radiator and the resevoir, you have to fill both, run the car for 10-15 minutes with the radiator cap back on, then refill, and do that a few times until you've replaced all the coolant you drained.

Just changed mine over the weekend

Good luck,

-tim

p.s. Changing your oil every 3k with Mobil 1 is a waste. That oil is good for 6,000 easily, even when driven hard, and more likley would be good up past 10,000 miles.
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Old 08-21-2003, 11:08 AM   #4
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Default Routine Maintenance

Quote:
I wouldn't use Prestone coolant in your car. I believe the coolant needs to be Phosphates and silicate free.
This is true. However, you don't have to go to the Subaru dealership to get the coolant. I used phosphate and silicate-free Havoline coolant from Wal-Mart ($5/gal.) I think it was called Dex-cool and it was an Orange color. Supposed to hold up 5 years/60,000 miles, but I'll probably change it before then. Make sure all the old coolant is drained completely. I drained old coolant, added distilled water and drained 2 or 3 times before finally adding the new Dex-cool along with distilled water.

For the rear diff., I bought 80w90 Valvoline synthetic blend in the 1 qt. bottle. As the bottle got low I had a hard time getting the oil to come out the bottle and into the rear diff. I recommend you get a pump ($3) so this isn't a problem. This is what I eventually had to do anyway because I couldn't raise the bottle up any higher b/c of clearance problems. Like everyone else said, just add gear oil to the top plug until it runs out.

Quote:
Changing your oil every 3k with Mobil 1 is a waste. That oil is good for 6,000 easily, even when driven hard, and more likely would be good up past 10,000 miles.
Mobil 1 synthetic is a really good oil and I think changing it every 3K would be great, but expensive. I heard testimonials of this oil lasting 25K miles. I guess the big issue here is the filter holding up. If I ran fully synthetic I would problem change the oil and filter every 6K, but what you are doing definitely won't hurt anything.

-Charles-
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Old 08-21-2003, 11:20 AM   #5
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If you do decide to use a coolant other than the Subaru Brand, I would perform a very good flush. I hear that mixing different brands/types of coolant can be a bad idea.
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Old 08-21-2003, 11:26 AM   #6
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Quote:
Originally posted by TimStevens
p.s. Changing your oil every 3k with Mobil 1 is a waste. That oil is good for 6,000 easily, even when driven hard, and more likley would be good up past 10,000 miles.
I second that. I had my Mobil 1 analyzed after 4000 miles in the car and some hard track driving, and they said it "looked" great. They said I should run it 5000 miles next time and have it analyzed again. Cool.
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Old 08-21-2003, 11:40 AM   #7
TimStevens
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More info on oil life:

http://neptune.spacebears.com/cars/s.../oil-life.html

These guys are up to 15,000 miles on Mobil 1, with a few filter changes in there and regular additions, so it keeps getting new life. But, the moral of the story is that 3,000 is way too soon I usually change around 7,500 every miles or so (twice a year) since the WRX rarely sees over 4,000 RPM

-tim
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Old 08-21-2003, 03:53 PM   #8
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I agree with GQ - mixing "Dex-cool" or equivalent with conventional coolant will cause problems. Also, Dex-Cool requires a tight system with no air (shouldn't be a problem for us, but GM has had nightmares with certain engines in certian cars.) or it will cause a clogging - orange/brown mud to form and plug up heater cores, and generally cause problems.

While Dex-Cool is silicate free, it is an OAT type product, while I believe the Subaru coolant is the conventional type. The two should not be mixed.)


(Long, but contains a good description of the many coolant types out there.

http://www.vectorbd.com/peugeot/archive/99_8/0415.html

http://www.geocities.com/b_gillie/dexcool_problems.html

Last edited by Wires; 10-08-2008 at 03:29 PM.
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Old 08-21-2003, 04:41 PM   #9
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Default Coolant....

I called my local suby dealer and asked what coolant to use. They said the regular green Ethylene Glycol 50/50 w/ water.

nick

(add water wetter too it really works.)
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Old 08-22-2003, 09:23 PM   #10
thng
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Be careful about changing synthetics at long intervals. The oil may be good but all the particulate matter that gets by the filter (the filter media will catch big stuff but not all the small stuff) flows with the oil. So if you keep the oil in for 25,000 miles you'll have 25,000 miles of very fine particulate matter in it grinding down your bearings. I change mine at 5K miles.

Besides, when I used fram filters (long ago) I found them to practically pack it in by about 10,000 miles. I actually started to cut my filters open just to look and see. I found one filter element crushed with almost no flow and one element rattling around inside. I use purolator now but even with those I don't keep them beyond 5K miles. Fram didn't have the bypass valves and purolators do but I don't want to be using the bypass valves for the wrong reasons.

Castrol 10W-50 synthetic or Mobil1 20W-50 synthetic.
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Old 08-22-2003, 10:54 PM   #11
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Where do you get your oil analyzed at?
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Old 08-23-2003, 10:54 PM   #12
thng
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Quote:
Originally posted by MAD REX
Where do you get your oil analyzed at?
Me? I don't. I just remember some filtration tests we did back at turd with both fuel and oil. Learned a lot of things back then. We had mobil1 engineers discussing their product since we had sponsorship then.

They said that the weak link was the filter media. The oil doesn't break down as readily as regular oil but the contaminants (by products of combustion, for instance) are very fine particulate matter. I don't remember what size that most filters are capable of filtering down to but they definitely are not in the small range. That's good enough for me; I know truck drivers send oil samples in to detect imminent bearing failure or something like that
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Old 08-24-2003, 01:40 PM   #13
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Quote:
Originally posted by MAD REX
Where do you get your oil analyzed at?
I get mine analyzed at Blackstone labs. Google it.

You can search for my analysis results in this section.
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