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Coolant in oil? #4473173
07/28/17 03:15 PM
07/28/17 03:15 PM
Joined: Apr 2017
Posts: 163
PA
Chester11 Offline OP
Chester11  Offline OP
Joined: Apr 2017
Posts: 163
PA
Hi guys:

2007 Mazda 6i here.

It has a small coolant leak that I can't seem to chase down.

Will a standard Blackstone UOA tell me if the car is leaking coolant into oil?

Re: Coolant in oil? [Re: Chester11] #4473181
07/28/17 03:25 PM
07/28/17 03:25 PM
Joined: Mar 2013
Posts: 5,030
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,030
The Midwest
It will, but I hope your not using an oil that contains sodium to skew the results. Let your engine sit on ramps for hours
letting the engine cool down. Crack the drain bolt and see if any coolant dribbles out.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Coolant in oil? [Re: skyactiv] #4473189
07/28/17 03:40 PM
07/28/17 03:40 PM
Joined: Apr 2017
Posts: 163
PA
Chester11 Offline OP
Chester11  Offline OP
Joined: Apr 2017
Posts: 163
PA
using the mazda FL22. I took the under cover off a few months back, and don't see any leakage.

it is difficult to read the tank. I can smell burning coolant - so it is going somewhere.

Re: Coolant in oil? [Re: Chester11] #4473204
07/28/17 03:59 PM
07/28/17 03:59 PM
Joined: Jul 2014
Posts: 128
North TEXAS
oldoak2000 Online content
oldoak2000  Online Content
Joined: Jul 2014
Posts: 128
North TEXAS
Originally Posted By: Chester11
using the mazda FL22. I took the under cover off a few months back, and don't see any leakage.

it is difficult to read the tank. I can smell burning coolant - so it is going somewhere.


prolly weeping onto exhaust manifold somewhere; oil level will INCREASE if it's ending up inside the block.

If you've already replaced all hoses AND waterpump, I've had good luck locating TINY leaks by totally emptying all coolant (including block), then pressurizing to 15/20 #'s with AIR, then listening around for HISSING sound - head cracks/gasket leaks are revealed by removing plugs and listening inside spark-plug hole (use a rubber tube - one end at ear, other in plug-hole, or anywhere leak suspected.

Re: Coolant in oil? [Re: Chester11] #4473253
07/28/17 05:06 PM
07/28/17 05:06 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
Take it to a reputable mechanic to get it checked. You don't to guess with coolant


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: Coolant in oil? [Re: Chester11] #4473611
07/29/17 03:20 AM
07/29/17 03:20 AM
Joined: Jan 2011
Posts: 2,826
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,826
N.Ohio
I would get the oil analyzed for contamination. Small internal leaks will not give the oil the milkshake appearance, as I found out, so you never really know.


The "thinking" man's friend.

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