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Old 08-29-2008, 08:55 AM   #1
ScottyB
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Default My oil analysis - '05 RS, 5W-30 Pennz. Platinum

Just thought i'd share my most recent oil analysis for my EJ253. as shown in the report its sitting at about 45k miles and this is the longest i've ever run oil at over 6k miles before changing (i'm old school and have had a hard time giving up the OMG CHANGE EVERY 3,000!!!1! mentality.). its had synth oil in it since new and i always use either Purolator or OEM filters.

my goal is to use synth oil to enable me to run the engine hard and still have extended use of the oil. i think reports like this are great to educate yourself on your engine's condition, find out what oil your engine likes and give you the info you need to get the most $$ out of your oil changes so you don't waste good oil.




i drive the car at least 45 miles a day and drive up to the mountains for some driving fun about 2 or 3 times an oil change. i was also able to fit an autocross in as well. this was also used in the middle of summer where we see some really high ambient temps (atlanta)

i'm happy with the wear metals, plenty of additive left, low fuel dilution and the viscosity hardly suffered at all. Silicon is also fine meaning my OEM air filter is doing its job. i would definitely recommend Pennzoil Platinum to anyone -- look up more results for this oil on www.bobistheoilguy.com if you want more feedback. drive on!
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Old 08-29-2008, 09:08 AM   #2
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Good report. N/A Subaru's are very easy on oil and you can usually go to 7,500 miles.

Although 1 qt. of make-up oil in an n/a car is a lot, IMO, and can skew the results a bit. What was the mileage on the interval when you added it? What oil filter were you using on this OCI? Your insolubles are just a tick higher than most Subies.

I would definitely run at least the 10w-30 in Atlanta with auto-x and sprited mountain driving.

-Dennis

Last edited by bluesubie; 08-29-2008 at 09:27 AM.
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Old 08-29-2008, 09:50 AM   #3
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Quote:
Originally Posted by bluesubie View Post
Although 1 qt. of make-up oil in an n/a car is a lot, IMO, and can skew the results a bit. What was the mileage on the interval when you added it? What oil filter were you using on this OCI? Your insolubles are just a tick higher than most Subies.

I would definitely run at least the 10w-30 in Atlanta with auto-x and sprited mountain driving.

-Dennis
1 quart was added little by little over the course of the oil use. whenever i fill up my tank i check the oil and add maybe an 1/8th of a quart at a time if it was approaching the low end of the dipstick. i use the subaru OEM filter.

is there a 10W-30 you would particularly recommend?
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Old 08-29-2008, 09:54 AM   #4
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Hell, if I was only adding 1qt every 6k miles I'd be thrilled!
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Old 08-29-2008, 10:44 AM   #5
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PP is good oil so you could stick with that.

Like Patrick, some people are fine with adding oil. Don't you race P.O.?

My wife's '99 Outback with 122k miles nor my daughter's '00 RS with 72k consume oil using Valvoline Max Life or Pennzoil High Mileage. The RS gets 5w-30 and the OB gets 10w-30 mixed with some 10w-40. High Mileage oils usually have beefier additive packs and are on the higher end of their viscosity range for the grade.

-Dennis
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Old 08-29-2008, 10:47 AM   #6
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Quote:
Originally Posted by bluesubie View Post
PP is good oil so you could stick with that.
-Dennis
sounds good, i'll look into a 10W-30. it used to consume more when i purchased the car...previous owner used royal purple 5W-30 and it would burn off 1 quart every 3-4k miles. since switching to PP and driving it pretty hard it has started using less and less (italian tune-up ftw!)
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Old 08-29-2008, 11:14 AM   #7
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yeah royal purple tends to be thinner than even other synthetics of similar grade, I wouldn't be surprised if your engine consumed more of it...
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Old 08-29-2008, 11:52 AM   #8
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ScottyB, thanks for the thorough and informative post. I may have to start running my synth longer!

Aaron
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Old 08-29-2008, 12:26 PM   #9
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I tend to find oil usage depends on the driving done. Track days, auto-xes, rally-xes, or anything that has a good duration of high rpm use seems to use up a bit of oil. I tend to find very little oil loss through normal driving, but run a couple sports events, and I'm down a ways.

Subarus in general are easy on oils. I've seen this said and said again. This means you don't have to worry too much about it breaking down the additive package in short order.

If you're finding that you run through a lot of oil, you might bump up the "hot" viscosity, so step to a 5w40 from your 5w30. This will be a little thicker when hot and offer both better protection and the potential for less loss through sport use. There are even 5w50 oils if you really want to use one. If the climate is always warm where you live, you can get away running a higher "cold" viscosity base weight. You can step from a 5w30 to a 10w30 and save a few $$$. If you don't need to cold viscosity for low temp starts, it doesn't really need to be there. You don't have to run a low base weight oil.
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Old 08-29-2008, 12:36 PM   #10
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Quote:
Originally Posted by Back Road Runner View Post
IIf you're finding that you run through a lot of oil, you might bump up the "hot" viscosity, so step to a 5w40 from your 5w30. This will be a little thicker when hot and offer both better protection and the potential for less loss through sport use.
Especially in the Southeast! I'm sure you folks have several 100F+ days during the summer.

Since PP 5w-40 is hard to find, you could add two qts of the 15w-50 to 3 qts of 10w-30. Or just look for a 5w-40 like Valvoline Synpower.

-Dennis
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Old 08-29-2008, 12:52 PM   #11
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Mobil 1 should be readily available. You could run their 5w40 SUV version, 10w40, 5w50, whatever. They have a lot of variety available. It will just depend on what your local stores carry...unless you want to order online regularly which is another option to get exactly what you want.
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Old 08-29-2008, 01:05 PM   #12
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what do you guys think of 5W-40 Rotella synth? i've heard its a great all around oil, its cheap and available and comes in a 5 quart container which is easy to store/carry.

i have been considering using a 40 weight but i've heard subarus run very tight tolerances on the low end and i wanted to play it safe with the thinner oils. i have also used "German" castrol (0W-30 but considered a "thick" 30)for 2 oil changes and although i didn't have it tested it ran smoothly. however that oil was expensive and sometimes hard to get a hold of.

how about Mobil 0W-40? i've heard it's Mobil's best 30 weight

Quote:
Originally Posted by Back Road Runner View Post
If you're finding that you run through a lot of oil, you might bump up the "hot" viscosity, so step to a 5w40 from your 5w30.
i'm not too concerned, just an observation. when i was running RP it was drinking it like crazy (1 quart per 3-4k miles, driving normally) but after bumping up to a more shear-resistant oil like PP i can live with 1 quart over 6k miles.

since the viscosity reading looks pretty good, do you think i should go up a weight just to take care of the oil usage or will this really provide more protection? i plan to run this car into the ground so i'm looking for the best means to keep it going strong for years.



thanks for teh feedback guys!

Last edited by ScottyB; 08-29-2008 at 01:11 PM.
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Old 08-29-2008, 01:59 PM   #13
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i used royal purple once and loved it except for the fact that it looked like used oil on the dipstick. i could never get over that. switched to amsoil and love it as well . it seems to last forever
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Old 08-29-2008, 02:04 PM   #14
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Rotella 5w-40 is a very good bang for the buck oil. GC is another great bang for the buck oil (when on sale) and I've ran it several times to 7,500+ miles in my turbo.

The manual allows 10w-30 and 10w-40 from 0F and higher so I don't think you have any worries with xw-40 being too thick. After seeing guys run 0w-20 in Ferrari's and Lambo's and a Jeep running a custom made 0w-10 in a Jeep, I think additives are more important than viscosity. Those examples are at bobistheoilguy.com and the oils have much higher additives than your typical Energy Conserving oil (Red Line and Renewable Lubricants Inc in the exotics).

How do you know that PP held it's viscosity since you constantly topped it off? Actually, I've seen it hold it's viscosity well in an STI although that guy had higher wear and stopped using it.
His UOA.

-Dennis
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Old 08-29-2008, 02:10 PM   #15
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Quote:
Originally Posted by bluesubie View Post
Rotella 5w-40 is a very good bang for the buck oil. GC is another great bang for the buck oil (when on sale) and I've ran it several times to 7,500+ miles in my turbo.

The manual allows 10w-30 and 10w-40 from 0F and higher so I don't think you have any worries with xw-40 being too thick. After seeing guys run 0w-20 in Ferrari's and Lambo's and a Jeep running a custom made 0w-10 in a Jeep, I think additives are more important than viscosity. Those examples are at bobistheoilguy.com and the oils have much higher additives than your typical Energy Conserving oil (Red Line and Renewable Lubricants Inc in the exotics).

How do you know that PP held it's viscosity since you constantly topped it off? Actually, I've seen it hold it's viscosity well in an STI although that guy had higher wear and stopped using it.
His UOA.

-Dennis
argh, i have yet to find a regular store that carries the rotella in that viscosity. All I see are the 15w40 variety.

FWIW, a local STi owner that regular tracks is 500+hp car uses rotella, his OA showed very good wear and longevity considering his car may see 20+ track days in a year...
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Old 08-29-2008, 03:12 PM   #16
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Quote:
Originally Posted by bluesubie View Post
After seeing guys run 0w-20 in Ferrari's and Lambo's and a Jeep running a custom made 0w-10 in a Jeep, I think additives are more important than viscosity.
i had seen these examples as well and that's part of the reason why i just couldn't bring myself to get a higher weight initially. i agree the manual states you can go thicker, i guess i figured that was for even more extreme treatment than i give the car. i had looked at alot of Rotella 5W-40 results on BITOG but they were primarily for turbo cars, so additionally i stuck with the PP partially because there was more feedback on that for N/A cars. i'm open to try the Rotella next time though!

and yeah, you're right about the viscosity - constantly topping off doesn't make it that accurate but its something to look at anyway.
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Old 12-19-2008, 08:25 AM   #17
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just got back my latest report. same oil, black subaru filter, and i stretched the milage another 600 miles over the last sample.

i got an autocross in on this round and alot of highway travelling. still haven't hit the ceiling yet as far as i'm concerned. good stuff!




this latest change i went to Rotella T 5W-40 to see how it performs since i'm going to try autocrossing even more in 09 and its cheaper than PP. we'll see how it stacks up.
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