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Chevy Blazer Has Water In The Oil

Q. I have a 1993 Chevy full size Blazer 4x4 with a 5.7 liter 350. I`ve had it for a little over a year now. When I first got it I noticed antifreeze leaking from the top of the intake and running down the back of the motor, so I checked the bolts and noticed they were very loose so I torqued them down and the problem was fixed, no more leaks.

Chevy Blazer Has Water In The Oil

I've put about 20,000 mile on it since then and went to check my oil and found water in the oil. Oil is milky looking on dip stick. Drained oil but the oil was not milky coming from the oil pan but did have water bubbles over top of drained oil. First thought is maybe just moisture getting in dipstick tube. So I changed oil, still finding milky looking oil when checking oil So first response is blown head gasket, pulled all plugs, none fouled all look good.

Done compression test on each cylinder come out at 180 psi on all cylinders. Stock specs say should be at 150 psi. So I pulled the valve cover off just to take a look and find everything looks new, there's no buildup of any kind. Oil looks great, checked head bolts, all tight.

Have any suggestions on where else water could be getting in oil from? All cylinders show good compression with no big difference on any of them. Usually a blown head gasket will show low compression on at least one cylinder if not two.

The Blazer runs great, no skipping or misses and no hesitation of any kind. Strong as always and no oil in radiator. Don't have money to just start replacing parts, any info or suggestions would be greatly helpful.

Thank you for your time,

A. Do yourself a favor and replace that intake manifold gasket. If it was loose and leaking outside it probably is cracked and leaking inside. Do it now or the small amount of coolant getting into crankcase will start etching the bearings.

This is a common problem with small blocks. No big deal just be careful when cleaning the old gaskets. Don't let any junk go down valley! Make a shield out of cardboard and fit it in valley before you start scraping the gaskets.

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