IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

Oil in coolant tank

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Drae
Posts: 4
Joined: Sun Mar 15, 2020 1:42 pm
Year and Model: 2004 s60 2.4l
Location: SC
Has thanked: 0
Been thanked: 0
United States of America
Drae

Oil in coolant tank

Post by Drae » Sun Mar 15, 2020 1:54 pm

I recently discovered oil in my coolant tank on my 2004 s60 2.4l non turbo, and after a good bit of research determined that the oil cooler located on the back of the oil pan was the culprit. There was no coolant in my oil leading me to believe the oil cooler and not a head gasket was the issue. So after replacing the oil cooler and associated gaskets, I started a flush. After running and draining water through the system all day, and despite a new oil cooler, I STILL have oil in my coolant tank. I've had soo many issues with the vehicle over the years I'm about at my breaking point. Any suggestions, knowledge, or resources pointing me in the right direction are much appreciated. Thank you in advance

User avatar
oragex
Posts: 4693
Joined: Fri May 24, 2013 6:20 am
Year and Model: S60 2003
Location: Canada
Has thanked: 94 times
Been thanked: 242 times
Contact:
Canada
oragex

Re: Oil in coolant tank

Post by oragex » Sun Mar 15, 2020 3:03 pm

How many miles on it? Did the gaskets at the cooler look damaged? Not sure how efficient is flushing the system - the heater core may keep oil in it and it can't be flushed because it takes the water pump to circulate the coolant. May try using one or two bottles of Prestone flush (it will foam a lot so keep an eye on the tank). Oil may also come from a head gasket or from mixing with transmission oil inside the radiator. Usually these engines past 2001 don't have issues with oil inside the coolant and even head gaskets are solid, but it will also depend on the maintenance history.

Drae
Posts: 4
Joined: Sun Mar 15, 2020 1:42 pm
Year and Model: 2004 s60 2.4l
Location: SC
Has thanked: 0
Been thanked: 0
United States of America
Drae

Re: Oil in coolant tank

Post by Drae » Sun Mar 15, 2020 6:51 pm

Thank you for the response. About 130,000 miles on it. Did not see damage to the gaskets when replacing. Will try some Preston flush. Thank you. Do you think replacing the heater core along with a flush would purge all remaining oil in the system? Or should I be looking at the head gasket as the primary culprit at this point even if there is no coolant in the oil?

jimmy57
Posts: 6551
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
Has thanked: 3 times
Been thanked: 232 times
jimmy57

Re: Oil in coolant tank

Post by jimmy57 » Sun Mar 15, 2020 7:02 pm

Put Cascade auto dishwasher soap in the system. It is non-sudsing and formulated to get oil and grease. It also has chemicals that make it rinse out. 3 times the amount for dishawasher and do it twice with a rinse between. This is what Volvo had dealers use for oil cooler ruptures.
Last edited by jimmy57 on Sun Mar 15, 2020 8:35 pm, edited 1 time in total.

Drae
Posts: 4
Joined: Sun Mar 15, 2020 1:42 pm
Year and Model: 2004 s60 2.4l
Location: SC
Has thanked: 0
Been thanked: 0
United States of America
Drae

Re: Oil in coolant tank

Post by Drae » Sun Mar 15, 2020 7:09 pm

Will be trying that tomorrow. Thank you for your response

Drae
Posts: 4
Joined: Sun Mar 15, 2020 1:42 pm
Year and Model: 2004 s60 2.4l
Location: SC
Has thanked: 0
Been thanked: 0
United States of America
Drae

Re: Oil in coolant tank

Post by Drae » Sun Mar 15, 2020 7:12 pm

Quick question is this the same cascade you would put in a dishwasher? If so does it have to be cascade?

Post Reply
  • Similar Topics
    Replies
    Views
    Last post