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Old 11-02-2003, 12:15 PM   #1
Scooby Newbie
Member#: 10952
Join Date: Oct 2001
Location: Cape May County
2006 subaru outback

Default no engine damage from piston slap

I just got my oil analysis back for my car . I have a 02 outback base wagon with 32 k miles on it . I have had the car diagnosed with piston slap at 6k miles . I use mobil 1 5w40 in the winter and 10w40 in the summer I change the oil at 5 k intervals . My oil came back normal for my engine . No abnormal wear due to the slap problem . So I guess SOA is right that it does no damage to the engine . I sent the oil to Blackstone labs . It cost 20 bucks and they supply the shipping container .
Well I felt so good about my car that I gave it a good detailing to day at work .
I now feel alot better and I'll just have to learn to live with the noise .

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Old 11-20-2003, 12:15 AM   #2
Scooby Newbie
Member#: 48742
Join Date: Nov 2003
Location: Boston
2002 BMW M3
1997 Subaru Legacy

Thumbs up

Piston slap is often caused by piston head deposits. In modern emission reducing engines, there is often less than 1mm of clearance between the piston at top dead center and the valves.

Use a bottle of Techron in your next fill up or two and your problem may magically disappear!
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Old 12-02-2003, 09:57 AM   #3
Rally Medic
Scooby Specialist
Member#: 28249
Join Date: Oct 2002
Chapter/Region: BAIC
Location: Gravel Crew HQ Medic
1998 Outback Sport
Dirty with some mud flaps


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Old 05-19-2004, 03:02 AM   #4
Scooby Newbie
Member#: 50874
Join Date: Dec 2003
Location: BC Canada
98 Outback Ltd

Default Techron for piston slap

I don't know about yours, but I've used Techron a couple of times a year and it really made no difference to the piston slap. My OB has had easy highway miles, fully warmed up at every start, regular oil and filter changes etc.... I'm pretty much convinced: it's a design flaw in the 98 model year of the 2.5 DOHC. With only 50k miles, it's hard to say how it'll affect the engine life, though. I got the Blackstone mail-paks recently, so I think I'll get it checked like you did. Here's hoping the results are as good as yours, too.
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