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Slow Oil Leak (possibly Bad Head Gasket)


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93 GS300 150K miles. I have a slow oil leak coming from the top of engine on pass side that is dripping on alternator which eventually caused alt to fail. I suspect a bad head gasket and I have read this is not uncommon for this model at high miles.

How much would a head gasket replacement cost roughly?

Are there any good stop-leak oil additives that may help?

I cringe at both options. I imagine it's expensive to replace the gasket and I am afraid any oil additives could potentially compound my problems (I also read this model is also known for excessive oil build-up which causes issues with the gasket).

Any information and advice is appreciated.

Thanks in advance.

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