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2002 2.9 S80 oil leak driving me mad

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
SlowLane
Posts: 9
Joined: Sun Sep 15, 2013 7:16 am
Year and Model: 1996 855 Turbo
Location: Livermore, CA
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SlowLane

Re: 2002 2.9 S80 oil leak driving me mad

Post by SlowLane » Tue Feb 11, 2020 4:35 pm

MoVolvos wrote:
Tue Feb 11, 2020 2:49 pm
Let us know, am curious what is causing the leak.
Will do. I hope to dive back into it this coming long weekend. Before I do I will be dumping some UV dye into the oil and running the engine for a bit in hopes that will highlight the problem area.

I'm now wondering if it might not just be the oil. I have been using Mobil 1 5W30 in this car for years without issues, but at the last oil change I decided to try Pentosin. also 5W30. The leaking started shortly after that oil change.
Current Volvos:
2002 2.9 S80 - Wife's car, the "Silver Flash"
1996 855 Turbo - Formerly daughter's ride. My toy now.

Former Volvos:
1997 855 GLT - Totalled by daughter. Now she appreciates Volvos. :wink:
1984 244 DL B23F - warped head after radiator blew
1982 245 GL B21A - My first Volvo. Sold with 400,000 km on it.

Other:
1981 VW Westfalia

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MoVolvos
Posts: 2137
Joined: Sun Jan 15, 2012 6:47 pm
Year and Model: 03S80T6~08C30T5
Location: NC
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MoVolvos

Re: 2002 2.9 S80 oil leak driving me mad

Post by MoVolvos » Wed Feb 12, 2020 4:17 pm

SlowLane wrote:
Tue Feb 11, 2020 4:35 pm
MoVolvos wrote:
Tue Feb 11, 2020 2:49 pm
Let us know, am curious what is causing the leak.
I'm now wondering if it might not just be the oil. I have been using Mobil 1 5W30 in this car for years without issues, but at the last oil change I decided to try Pentosin. also 5W30. The leaking started shortly after that oil change.
Many people have had very bad experience with Synthetic to Dino and Dino to Synthetic. Googled and found one person had problem with the Mobil 1 5W30 in particular. Had trouble years ago with Mobil 1 causing 3 head gasket leaks. This is way before the internet.

Recently tried the Mobil 1 0W-40 from Costco and the 03 Odyssey howled and groan when passing WOT. No problems with Rotella T6 5W-40 and currently running Kirkland's 0W-30 (just changed) and can't hear the engine.

$5 cheaper in warehouse
https://www.costco.com/kirkland-signatu ... 27865.html
Blessings,

BKM

1998 S70 T5 - Donated
2003 S80 T6
2003 GS300
2003 Odyssey
2008 C30 T5
2019 Atlas SE 4 Motion

SlowLane
Posts: 9
Joined: Sun Sep 15, 2013 7:16 am
Year and Model: 1996 855 Turbo
Location: Livermore, CA
Has thanked: 0
Been thanked: 1 time
United States of America
SlowLane

Re: 2002 2.9 S80 oil leak driving me mad

Post by SlowLane » Thu Feb 13, 2020 1:48 pm

Pentosin and Mobil 1 are both full synthetics, so I wouldn't have expected any issues. Having said that, there's far too much apocrypha out there surrounding motor oil to form any sound judgment.
Regardless, I've committed to diving back into the front seals one last time in a more comprehensive fashion. Both cam seals, new VVT hub (just 'cause I spent the bucks for one) new crank seal, new piston oil squirter valve thingy and gasket, new timing belt. If it still leaks after all that I'll probably be reluctantly looking for another car. Which would be a pity, as this one has served us well for 13 years and still runs fine aside from this dratted leak.
Current Volvos:
2002 2.9 S80 - Wife's car, the "Silver Flash"
1996 855 Turbo - Formerly daughter's ride. My toy now.

Former Volvos:
1997 855 GLT - Totalled by daughter. Now she appreciates Volvos. :wink:
1984 244 DL B23F - warped head after radiator blew
1982 245 GL B21A - My first Volvo. Sold with 400,000 km on it.

Other:
1981 VW Westfalia

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