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Old 02-20-2005, 06:46 PM   #1
Needles
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Default Another oil question

Looked in Unabomber's FAQ didn't find what I was looking for. I want to switch to synthetic oil, but I found this thread at L. I. S. C.com. Dave from Metric Subaru,in, NY recommends 10-30 or 10-40 oil, not synthetic oil in the WRX,STI's.So my questions are should I switch to synthetic? If I do switch what weight should I switch to? If I switch should I use an engine oil flush prior to the synthetic conversion? Please put me on the straight path.
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Old 02-20-2005, 07:22 PM   #2
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Mobil One 5-30....change it...
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Old 02-20-2005, 07:29 PM   #3
sdogg3kgt
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Quote:
Originally Posted by mmorningstar
Mobil One 5-30....change it...
What he said. 5 W 30 is what is recommended for our cars, and unless you have a high mileage car it'll only benefit the life of your engine.
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Old 02-20-2005, 07:31 PM   #4
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Your call. Switch to synthetic and use the appropriate range for your area. 0-30W should be fine this time of the year and when it gets warmer switch 10-40. Don't bother flushing, just empty your oil pan real good.
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Old 02-20-2005, 07:33 PM   #5
mmorningstar
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^^^^yeah flushing not needed for this

Mobil One 5-30, OEM filter
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Old 02-20-2005, 07:40 PM   #6
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I put Redline in at 7000K. Go find out why I treat my STi to Redline. http://www.redlineoil.com/ Click on the Demo "proven to out perform" and turn up your speakers.
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Old 02-20-2005, 07:41 PM   #7
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Yeah, like everyone else has said, no flushing needed. Just let it drain for a really really long time so that all the oil gets out. When i switched from mineral to synthetic, I let it sit for 30 minutes.

I use Mobil 1 5W-30 and OEM oil filter, works really well for me.
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Old 02-20-2005, 09:00 PM   #8
Needles
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Isn't 5W-30 synthetic to thin and burns up to fast.Is this true?
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Old 02-20-2005, 09:18 PM   #9
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Quote:
Originally Posted by ADR 04STi
I put Redline in at 7000K. Go find out why I treat my STi to Redline. http://www.redlineoil.com/ Click on the Demo "proven to out perform" and turn up your speakers.
Redline is great oil! But Mobil One, Royal Purple, Amsoil, etc, will be just as good....
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Old 02-20-2005, 09:44 PM   #10
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You do realize that switching to XX brand oil with XX weight will net you zero HP and zero increased reliability right? Open your owner's manual, read what it says, and do it. Dave from Metric Subaru does not know more than Fuji engineers or the American Petroleum Institute, which both recommend 5W-30 regular or synthetic that is API approved.
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Old 02-20-2005, 10:53 PM   #11
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Quote:
Originally Posted by Unabomber
You do realize that switching to XX brand oil with XX weight will net you zero HP and zero increased reliability right? Open your owner's manual, read what it says, and do it. Dave from Metric Subaru does not know more than Fuji engineers or the American Petroleum Institute, which both recommend 5W-30 regular or synthetic that is API approved.
I agree. What makes you guys think you know more about your car's lubrication needs than the engineers that designed it? All automotive engineers spend a lot of time developing lubrication requirements. It's a class we take in school.
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Old 02-23-2005, 09:19 PM   #12
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Quote:
Posted by ADR 04STi:I put Redline in at 7000K. Go find out why I treat my STi to Redline. http://www.redlineoil.com/ Click on the Demo "proven to out perform" and turn up your speakers.
Redline could well be the finest petroleum elixir on the planet. My Rex loves it.

Don't lose any sleep wondering whether you should put it in or not. If the Redline Goddess deems you worthy, you will find yourself pouring it into your crankcase one day. She chooses you, not the other way around. Don't ask me why, but it's true. You still gotta pay for it though.
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Old 02-23-2005, 09:58 PM   #13
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Quote:
Originally Posted by Unabomber
You do realize that switching to XX brand oil with XX weight will net you zero HP and zero increased reliability right? Open your owner's manual, read what it says, and do it. Dave from Metric Subaru does not know more than Fuji engineers or the American Petroleum Institute, which both recommend 5W-30 regular or synthetic that is API approved.
But lots of people know more than CAFE.

Not to diss your FAQ's, which you put a lot of time and effort into, but a blanket 5/30 recommendation by Subaru is BS. That is not the optimum oil for subies necessarily, but it is the optimum oil for economy and pollution purposes.

Subaru has to keep their numbers down, and if your WRX loses a bit of life or performance because they tell you to put a lesser oil in your car, why should they care? Any problems that occur will be WELL after the warranty expires, and it will be YOUR hard earned cash being spent, not theirs.

Do whatever you want. Just realize why you are doing it. Most here will probably not keep their cars until it dies anyway and will trade in or upgrade, so who cares.
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Old 02-23-2005, 11:15 PM   #14
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Default oil

Anything from 5W30 to 10W40 is acceptable according to Subaru. Which weight depends on the ambient conditions. Look in your owner's manual toward the back. Above freezing, 10W40 is fine. If the temp gets below 32degrees, use a lower weight (ie 5W30). I use 5W30 and then change to 10W40 in the spring/summer (Philly gets pretty cold in the winter). The ONLY reason 5W30 is recommended is for mileage sake. The lighter weights (ie 5W30) allow for better mileage (lower viscosity, less friction/resistance in the valvetrain/reciprocating mass). Your mileage will likely decrease when using heavier oil weights (but a small price to pay for better protection, IMHO). The only true way to tell which oil is the best for YOUR car is to run a specific weight (synthetic/dino/ or blend) and then send the oil in for analysis after 3000-5000 miles. Blackstone labs does it pretty cheap (I think it's blackstone-labs.com). As for synthetic vs. dino, it has been conclusively proven that synthetic (real synthetic-ie PAO based stock like Royal Purple, Motul 300V, Amsoil- there are others) has better thermal characteristics, less shearing than dino oil, and extend drain intervals to 2-3 times what a dino oil change would require (hence, offsetting the increased cost). However, feel free to research the topic further on your own.
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Old 02-23-2005, 11:17 PM   #15
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5w30 M1 is too damned thin except in a cold as hell winter climate and MOST DEFINITLY too damned thin for summer use.
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Old 02-24-2005, 09:06 AM   #16
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Quote:
Originally Posted by phlegmon
Anything from 5W30 to 10W40 is acceptable according to Subaru. Which weight depends on the ambient conditions. Look in your owner's manual toward the back. Above freezing, 10W40 is fine. If the temp gets below 32degrees, use a lower weight (ie 5W30). I use 5W30 and then change to 10W40 in the spring/summer (Philly gets pretty cold in the winter). The ONLY reason 5W30 is recommended is for mileage sake.
OMG, somebody read the manual!

If you're switching to synthetic, 10W30 would be fine for a NY winter. For hard use or high temps, I would use something thicker. I'm running German Syntec 0W30 which is thicker and more shear stable than any Mobil1 30 weight. I'll be switching to M1 0W40 next.

Even a conventional 10W30 will pump fine in freezing temps.

-Dennis
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Old 02-24-2005, 10:08 AM   #17
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bluesubie, why not the T&S 5-40 next?? Its a better, I think.
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Old 02-24-2005, 10:49 AM   #18
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Quote:
Originally Posted by poison
bluesubie, why not the T&S 5-40 next?? Its a better, I think.
My daily drive is 5 miles so I was thinking that the 5/40 might not warm up quick enough for those few miles.

But after seeing Patman's latest GC UOA on Bitog , I might just stick with that for the summer. The viscosity was 12.4 at 100C and that included 14 1/4 mile runs. I'll be sending in my GC for UOA (6K OCI) within a couple of weeks.

Decisions, decisions!

-Dennis

Last edited by bluesubie; 02-24-2005 at 11:16 AM.
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Old 02-24-2005, 11:04 AM   #19
poison
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Yeah, the GC is insane stuff. I am on my second OCI, and I was going to send a sample of this one out at 6000, but I may not even bother. My driving is 50% or more freeway and I live in temperate soCal; I do drive hard however. I feel very comfortable with 6000 OCI's. If I decide to go to 7500, which I'm betting I could, I will hit Blackstone up.

Next change I may try the T&S.

I bet you're right about the 5/40 being thick for a 5 mile drive.
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