menacer1974

I have a 91 c1500 stepside with a 4.3 i checking the oil there milky looking oil on the dipstick i change the oil none of the oil in the crank case was milky
its been about a week went a changed the oil i checked again and there is milky oil on the dipstick again need help

Polydorus

Are you losing any antifreeze?

EricBrooks75

Usually that means a head gasket blew internally and the antifreeze is mixing in with the oil. That's why it looks milky. That really sucks. Hope you've torn an engine down before and you have someone who can help you pull it. Any improvement ideas you might have had, now would be the time to do them.

menacer1974

im not losing any coolant at all

Allan In NE

If you are not losing coolant, then what you are seeing is from condensation. Are you just doing short little trips where the engine doesn't really have time to heat up?

Take 'er out on a good 40 mile run and then drop the oil when you get home when it's good and hot.

Allan

EricBrooks75

You might not even notice it if it isn't really bad yet, but that's the only thing that could mix with the oil that would cause it. If it's not leaking a whole lot yet, you probably wont even have to have the block and heads surfaced. Fel-Pro makes some fool-proof gaskets that are guaranteed not to leak. I would definitely go over the surfaces on the block and the heads with some scotch-brite really good though. Since the oil is thicker, it usually doesn't bleed back into the anti-freeze. It's the same with trans fluid if you have holes in the trans cooler lines, but the trans fluid gets really bubbly.

EricBrooks75

Allan In NE may be right. I've never seen condensation in oil, but then again, I sit in traffic a lot. I'm no expert by any means. Looked at the pictures. Nice truck. What size engine does that have in it? I have an 88 C1500, but I need to just get a new engine for it. It has a 305 in it, and I'm pretty sure piston rings are leaking. Not worth rebuilding at this point. I would like to find a 383 for it.

Doekstr3Z71

I'm going to have to agree with Allan In NE, I have seen this a lot, mostly with newer vehicles. Short drives will cause condensation in the crank case, and the shorter the drive the worse it is. EricBrooks75 has a good point as well, a very small coolant leak can also cause this condition, and being a 4.3L I could definatly see it being plausible.

menacer1974

Thanks guy i'm gonna try driving it for awhile to see if it is just
condensation