I recently had the head milled .53" on my 75 D100 pickup. I had 340 valve springs installed with new bronze guides, seals, new FelPro head gasket, etc. It has a distribuor recurve from DI and it runs like a champ and I am very pleased with the outcome so far. However I keep noticing a fair amount of milky condensation on the backside of the oil cap and a trace on the dipstick. The pcv valve is new and appears to be working properly and it doesnt seem to be losing coolant from keeping a close eye on coolant level. I have a short drive to work only 20 min with lots of stop and go. I drive it everyday but it doesnt see alot of long driving or highway time.
I started driving the truck after I did the engine work back in September and when the weather was hotter this condition seemed to be alot less on those days it just got worse in the colder weather. Hopefully you guys can give me some insight on what could be causing this or if it is normal or not.

Thanks, Sam

How long is the motor up to temp. It's probably just condensation from your short commute. Go take it out on the highway for a good run.

That salad dressing is a result of moisture in crankcase be it from atmosphere and short trips not getting up to temperature, or internal coolant leak. If it’s cold humid weather causing this, install a 195* thermostat, and once a week take a good long ride to boil off the condensation. If it is a coolant leak, it has to be located and repaired.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

The temp guage shows halfway and gets up there now and stays within the first couple of miles of driving. I just installed a 195 degree thermostat a few weeks back. Before that I had installed the wrong one and the temp guage wouldnt hardly come up at all no matter how far you drove it seemed. I wonder if that has anything to do with causing the condition? Also if it has a slow leak somewhere, where would be some good places to start looking? Thanks for the replies guys!

Sam

There is your problem. Take for a good long highway drive and let the engine get good and hot for an extended period of time. I bet once you do that the oil will look fine.

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Casually looking for a Clifford hyperpak intake for cheap.

Reed's right. Slants are really slow to warm up. In the winter there are many days where the condensation is so bad that when I pop the hood it looks like just rained under the hood. The fist few years after I got the car there was always some milky residue on the dipstick, PCV or on the oil cap.

Since I went to electric fans, the milky oil problem stopped. On the weekends I make many short hops, worst is 4 miles to the grocery store. The fans never come on allowing the the engine to warm up much faster. Even running a 180 stat I have no problems. I used to run a 195 and even a 205 stat to try to reduce the problem. During the week the engine gets some long distant driving which helps.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

You bet it did. I also bet if you were to remove valve cover it too would be caked with the same emulsion.

Excellent 195*, like Reed said, go drive it; I would run it nonstop for a few hours and that should do it. You have to get the oil hot enough to vaporize any moisture formed from never getting the engine up to operating temperature with that bad thermostat. Just the chemical reaction of burning fuel causes a lot of condensation, some of it finds its way to crank case, the rest works to rot out the exhaust system.

Just keep an eye on it for a few weeks of normal daily routine operation after the big trip; it may be enough, if not, try to work in an hour drive per week. Your spring is just around the corner.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

When I lived near campus my 2 mile drive gave me the exact probelm as described. I started taking the car for long drives on the weekends and it went away.

Kev

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Thanks for all the replies guys, I think I'll take it out for a nice long drive now and see, that should take care of it. I was hoping that was all it was but wasnt sure. Its been a long time since Ive owned a slant and dont remember the other ones being like this but this one sure is.

Thanks, Sam

My friend with a van frets about this every year. I told him do the hotter thermostat, thinner oil. Hwas using 10-40. I got him to use the 10-30 Rotella. The extremely long dip stick tube on the trucks collects the moisture.

I diid the oil on the wife's Caravan yesterday in 39^ weather. The Castrol 10-30 dino poured a bunch quicker than the 10-30 semi synthetic 10-30 Rotella.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

Update:
I took it out and drove it over 60 miles yesterday and then looked ay it and did notice a big decrease in amount of the "salad dressing" on the dipstick. Rugtrucker, your right alot of it collects in the long truck dipstick tube. Hopefully this will not be a problem anymore once the weather warms up in the spring and it cant get here quick enough for me. I'll probably change the oil at that time also. I drive a "big" truck from Knoxville to Chicago and back every other day so as you can imagine I'm glad to see winter go away.

Wave at me on I65! I drve a big truck to Columbus Indiana M-F.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

I drove my truck from northeast Pa to downeast Maine ,one winter a few years ago.....when I got there and checked oil...inside vavlecover was coated with milky oil....had 195 stat in...when temps warmed it whent away

I grew up in Anchorage, Alaska. We had the milky oil issue every winter. Of course, we also used to have to let the car run for 30 minutes in the driveway just to warm it up enough to have hot air out the heater vents.

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Casually looking for a Clifford hyperpak intake for cheap.