Possible bad head gasket on my H6? - Subaru Outback - Subaru Outback Forums
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post #1 of 5 (permalink) Old 01-11-2017, 03:08 PM Thread Starter
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Possible bad head gasket on my H6?

Hey guys, so I did an oil change today on my H6 outback and noticed the oil was a bit frothy/foamy.

I also noticed the coolant overflow reservoir was down almost to the "low" line. Are these signs that my head gasket is bad?

I have not noticed any external coolant leakage when parked so that could be another sign that the coolant is going into the oil correct?

Thanks in advance for any help,

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post #2 of 5 (permalink) Old 01-11-2017, 04:12 PM
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Normally when HG's fail on the H6 the overflow will fill well above the full line due to exhaust gas over pressurizing the cooling system. Another clear sign is the coolant will not siphon back during the cooling of the engine. Also there is not normally any sign of coolant in the oil but there is evidence of exhaust gasses/oil in the coolant. The coolant overflow will smell like exhaust gas/oil.

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post #3 of 5 (permalink) Old 01-11-2017, 04:22 PM
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exhaust gasses go into the overfill bottle (dirty exhaust gas),...if you get clean air you have porous coolant lines leaking and drawing it in someplace like the back of the engine.

also, you might get some exhaust at the tailpipe that smells like coolant when the car is hot.

what year is that car? how many miles on it?

a little loss in coolant is not a big deal in any car. once in a great while I have had to add 12oz of mix to almost every vehicle of every type I have owned. (a great while, like 12 -24 months).

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post #4 of 5 (permalink) Old 01-12-2017, 08:40 AM
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That just looks like air bubbles, but photos can be deceiving.

Those engines don't typically mix coolant and oil - unless the headgaskets have been previously replaced or the engine has been severely overheated.

The bigger question - is why are you worried about it and checking? if there's a specific reason then fill us in.

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post #5 of 5 (permalink) Old 01-12-2017, 09:43 AM
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if you still have some - you could send the oil in for analysis, Blackstone Labs.

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