Question about 1991 GMC S-15 Jimmy

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If it is milky it is coolant due to bad head gaskette.
If it looks like durt oil needs to be changed.
You can also check the oil dip stick fo deposition.
Please let me know if you need more info. I am here to help
Good Luck

Posted on Jan 18, 2009


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sounds like you have a bad pcv valve or a more unlikely a head gasket about to go out

Jan 18, 2009 | 1991 GMC S-15 Jimmy

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it is start of blown cylinder head gasket, change it before you have engine over heat.

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it is looking like it could be is the car run regulary? as sometimes when its cold a build up of condensation causes the cap that has oil on it to turn milky can you take the breather pipe off and check there if there is a build up there it could be the start of a headgasket problem.

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