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Old 08-04-2012, 11:35 AM   #1
UAL912
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Join Date: Aug 2009
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Location: Chicago
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2009 Impreza 2.5i
Metallic Silver

Default 5K Pennzoil synthetic report

1st report and I am losing a bit of coolant but the exhaust looks normal and no leaks can be seen as well, so it looks like I'll have to take it to a mechanic if I can't find the source.

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Old 08-04-2012, 12:18 PM   #2
gpshumway
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Which Pennzoil synthetic? Platinum or Ultra?

It stayed in grade and seems to be performing well, but that's not surprising in a N/A Subaru, they're much easier on oil than the turbo cars. The 1.6 TBN after 5k miles is a little surprising (low). Do you drive a lot of short trips?

I don't have any good advice on finding the coolant leak. It sounds like it might only happen when the system has pressure. Put dye in it and get out the black light.
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Old 08-04-2012, 12:23 PM   #3
UAL912
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Quote:
Originally Posted by gpshumway View Post
Which Pennzoil synthetic? Platinum or Ultra?

It stayed in grade and seems to be performing well, but that's not surprising in a N/A Subaru, they're much easier on oil than the turbo cars. The 1.6 TBN after 5k miles is a little surprising (low). Do you drive a lot of short trips?

I don't have any good advice on finding the coolant leak. It sounds like it might only happen when the system has pressure. Put dye in it and get out the black light.
I use the Platinum version and most trips are usually 10 miles or less one way although every other week I make a 40 mile round trip (highway) to and from a suburb around here. I'll try using dye and will get back to you.
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Old 08-04-2012, 12:44 PM   #4
bluesubie
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Not sure I'd extend much farther with the TBN that low. Some labs would flag this as abnormal. What air filter are you using?

-Dennis
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Old 08-04-2012, 12:52 PM   #5
UAL912
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Metallic Silver

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The air intake is stock and I replaced the air filter at 30K with a purolator A35592.
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Old 08-04-2012, 04:43 PM   #6
gpshumway
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Originally Posted by UAL912 View Post
I use the Platinum version and most trips are usually 10 miles or less one way although every other week I make a 40 mile round trip (highway) to and from a suburb around here. I'll try using dye and will get back to you.
Trips that short will deplete TBN quickly. Otherwise it looks like great oil for your car. Stick to 5,000mi OCIs, don't listen to Blackstone.

Just FYI. My father has run two fills of Pennzoil Platinum in his 2010 Outback 3.6R. With lots of highway driving his TBN came back 4.5 and 6.4 after 4,500 and 5,100 miles respectively. The 4.5 reading was over the winter, 6.4 was over the summer. Cold running depletes TBN quickly.

Quote:
Originally Posted by bluesubie View Post
Not sure I'd extend much farther with the TBN that low. Some labs would flag this as abnormal. What air filter are you using?

-Dennis
Yea, Blackstone can be a bit overly aggressive with their OCI recommendations. They must have some real cheapskates working there.

Engine sludge FTL.
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Old 08-05-2012, 01:47 PM   #7
UAL912
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Well I could stick to 5,000 for the winter months and see what happens.
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Old 08-05-2012, 02:29 PM   #8
gpshumway
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07 WRX LTD Wagon
Satin White Pearl

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5,000 should be fine. Do a UOA to confirm of course.
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