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Hey y'all, I've got a 300ci in my '66 and just noticed the milkshake sludge in the top of the valve cover indicating a water oil mix somewhere. Any suggestions where to check out? I've got a leak of some kind at the fuel pump, but I haven't begun digging in on that yet. Initial thought is oil, but there may be some fuel or water in there too. Do I need to check the head? I had a 6.0l powerstroke that had this issue and it was because one of the heads was cracked. Is that a failure point here? There's not a lot to this motor so I imagine there can only be so many things to check.
It's got some other issues so I think the longest drive I've taken it on recently was roughly half an hour. Usually I'm just driving it across town in 15 minute spurts.
You have a lot of condensation in there, but it's possible to be from the short trips, especially if you live where there is a good bit of humidity or temperature changes. I've seen it before. It happened on the Dodge in my signature. I didn't drive it very often, or very far. I found cream inside the valve cover and was afraid I had a bad head. Got the engine good and hot on a weekend long drive, and changed the oil. The milky stuff disappeared completely after the oil change.
I always run diesel oil to compensate for the way I use my trucks. You would need it in order to save the cam and keep the inside of the engine clean.
I'm in Colorado where it's real dry. I keep the thing in the garage when there's rain or snow so that isn't due to moisture. I suppose it could be from the trips. Wiped the inside of the valve cover clean and I'll check it again tomorrow after driving it around for a bit. I also saw a bit on the top of the dipstick which is concerning.
You have a lot of condensation in there, but it's possible to be from the short trips, especially if you live where there is a good bit of humidity or temperature changes. I've seen it before. It happened on the Dodge in my signature. I didn't drive it very often, or very far. I found cream inside the valve cover and was afraid I had a bad head. Got the engine good and hot on a weekend long drive, and changed the oil. The milky stuff disappeared completely after the oil change.
I always run diesel oil to compensate for the way I use my trucks. You would need it in order to save the cam and keep the inside of the engine clean.
Is that the Rotella 15w-40 everyone is always mentioning?
A quick and dirty way to check for a blown head gasket on a vehicle you don't drive much is to just let it sit for a while (few days / week) and then crack the oil pain drain plug. Just enough to let a tablespoon or so pour out.
If there's coolant in the oil, it'll be the first thing to come out. Letting it sit for a few allows the oil and coolant to separate and the oil to float on top. This doesn't work on something you drive every day as it's fully churned and mixed up.
I got my 81 F100 with a 300 six on the road back in November and a few weeks ago checked the oil and it had the "milk shake" in it.
Had to pull & wipe the stick a few times before I could get a reading.
I pulled the fill cap and it had the "shake" on it but looking inside looked clean so I did mot worry about it.
I do drive my truck 30+ miles each way to work, the temp gauge is reading low and it does have a new stat but could be stuck open I guess?
I have not loss any coolant so I cant see it getting to the oil.
The PCV is also working as I checked that also.
For me I will just keep an eye on it but going to keep driving it other wise.
Dave ----
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