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Old 02-20-2012, 11:54 PM   #1
Bpatts
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Member#: 288358
Join Date: Jul 2011
Chapter/Region: MWSOC
Location: Michigan and NY
Vehicle:
2005 Wrx Sedan
Silver

Default Blackstone Labs UOA Results

Car: 2005 Wrx
Mileage: 92500
Bone Stock

Just got my first UOA from Blackstone Labs. Bought the car at 86k, previous owner used basic dino oil. I am continuing to do so, I'm afraid that if I switch over to synthetic that the car will start to develop oil leaks.

Anyways, I was a little concerned on the copper amount even though they doubt the levels are anything to worry about.

Would high copper levels be bearing material?

Looks like the UOA is ok for now. Your opinions?

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Old 02-21-2012, 10:06 AM   #2
68Cadillac
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Location: Las Vegas, USA
Default

Bearing are made from Babbitt. Babbitt is a metal alloy like bronze is a metal alloy.

Quote:
There are many Babbitt alloys in addition to Babbitt's original. Some common compositions are:

90% tin, 10% copper
89% tin, 7% antimony, 4% copper
80% lead, 15% antimony, 5% tin
76% copper, 24% lead
75% lead, 10% tin
67% copper, 28% tin, 5% lead

Internal combustion motors use Babbitt metal which is primarily tin-based because it can withstand the pounding. Lead-based Babbitt tends to work-harden and develop cracks but it is suitable for constant-turning tools such as sawblades.
For bearing wear in a Subaru UOA you need to look to the lead content. You're good.

Last edited by 68Cadillac; 02-21-2012 at 10:11 AM.
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Old 02-21-2012, 10:52 AM   #3
Bpatts
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2005 Wrx Sedan
Silver

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Quote:
Originally Posted by 68Cadillac View Post
Bearing are made from Babbitt. Babbitt is a metal alloy like bronze is a metal alloy.



For bearing wear in a Subaru UOA you need to look to the lead content. You're good.

I learn something new everyday. Thanks for the input. Bearing wear was my biggest concern.
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Old 02-21-2012, 12:18 PM   #4
WeldingHank
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Location: Lawrence,ma
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unless you think the oil is really sluged, I wouldn't worry about switching to synthetic.

I have switched cars as late as 130K in the past without issue.
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Old 02-21-2012, 05:52 PM   #5
bluesubie
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04 FXT

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Does the '05 have an oil cooler? I definitely would switch to synthetic. Try Max Life Full Synthetic if available or Mobil1 High Mileage if you're concerned about leaks.

-Dennis
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