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#4473173 - 07/28/17 04:15 PM Coolant in oil?
Chester11 Offline


Registered: 04/13/17
Posts: 130
Loc: 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?

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#4473181 - 07/28/17 04:25 PM Re: Coolant in oil? [Re: Chester11]
skyactiv Online   content


Registered: 03/02/13
Posts: 4408
Loc: 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.
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Me: 13' VW GTI 3 door 6 speed manual

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#4473189 - 07/28/17 04:40 PM Re: Coolant in oil? [Re: skyactiv]
Chester11 Offline


Registered: 04/13/17
Posts: 130
Loc: 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.

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#4473204 - 07/28/17 04:59 PM Re: Coolant in oil? [Re: Chester11]
oldoak2000 Offline


Registered: 07/23/14
Posts: 119
Loc: 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.

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#4473253 - 07/28/17 06:06 PM Re: Coolant in oil? [Re: Chester11]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 472
Loc: Texas (south)
Take it to a reputable mechanic to get it checked. You don't to guess with coolant
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#4473611 - 07/29/17 04:20 AM Re: Coolant in oil? [Re: Chester11]
Lubener Offline


Registered: 01/22/11
Posts: 2577
Loc: 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.
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