Hi All,

I'm new to the forum as a poster, but have been reading for a while. A few things brought on the urge/need to post.

I have a 2000 Expy 5.5 4x4 AWD XLT, with 60000 miles on it. I decided to keep it instead of trading it in when I paid it off this summer. Since then, I've been in search of better gas milage/performance. I have been gettin about 12.5 mpg with a even mix of highway and around town.

I reciently changed all the fluids to systhetic, changed the plugs to +4's, put in an AEM Brute Force Intake system, a new PCV valve, and added a Gibson SIDO exhaust.

Love the sound of the truck now, on both sides, but just noticed a milky film of oil on my fill cap ( I check all the time because she has always burned oil. Dealship said it was all good to do a quart every 1000, what BS!).

I broke the truck in with dino oil, switched to amsoil at 3.5k, and switched back to dino at 36k, hoping to stem the tide of the oil consumption. At 50k I put in a quart of the Lucas oil additive (proably lead in oil suspension) which did the trick. At 59k, I decided to tru mobil 1. I've had it in for about 1500mi. It did not produce this milky stuff until after I put the intake on.

I think the intake system is not providing enough vaccumme to properly exhaust the vlave covers. what to you all think?

Hope this make sense,

Thanks, Larry

 

PS: Sorry for the horrid spelling. I will not be so sloppy again. BTW, it is a 5.4.

Larry

 

I just went to check everything again, and found the PCV valve was not connected to the valve cover correctly. I must have pulled it loose when I put the intake on. I'll post tomorrow and let you know.

I should say though, that after searching for "milky" throught the forums, all of the people who specified the oil they were using specified Mobil 1. Strange, no?

 

I think you found the problem when you saw the PCV valve wasn't hooked up.

This thing about milky crap on the oil cap is perfectly normal. Even an engine is going to have moisture inside; it's just part of our environment. One of the things that PCV system does is allow that moisture to leave the oil and be redirected into the combustion chamber. Depending on the temperature, it can take over an hour of driving to burn off all of the moisture that is in the crankcase. It's natural for any moisture in the oil to rise and end up on the oil cap.

This is what coolant in the oil looks like: Photo

 

Apparently oil and antifreeze dont mix very well? You can actually see the little drops of antifreeze suspended in the one drop of oil.

Good pic AjRagno.

 

Amazing isn't it? The coolant really does settle at the bottom of the crankcase. When I saw the coolant dripping out, I had to get pictures because I'd never seen that before.

 

Its just the two liquids have different densities, basic physics stuff

Same thing will happen if you put some oil in a bottle and some water (and dont mix). They stay seperate from each other.

 

 

If you saw my originial post I realized my error right after I posted. See edit

 

Larry,

try the clean up method, that will make a difference.

Change the fuel filter, clean the MAF, clean the engine with Auto-RX, and the injectors with Schaeffer's Neutra 131. The Auto-RX treatment should reduce you oil consumption too.

 

Larry-

Get rid of the Bosch +4 Plats. They suck dookie. I'm suprised you aren't missing! Stick with Motorcraft, Denso, NGK...just stay away from those Bosch pieces of *****!

 

Gents,

The PCV valve fixed it. Drove the truck to Newport RI from Stamford CT on Friday night. Passed (safley) everyone. I must admit to having a new love & respect for my truck. Absolutly wonderful in the snow.

I'm wondering if I should change the plugs again as per the above reccomendations. It was such a PITA to do it the first time, and it seems to be running great.

I'm also wondring if I should change the differential fluids after playing in the snow in RI this weekend. My girlfriend and I went 4 wheeling on Saturday night in the blizzard. Wind was +40 knots, snow was everywhere, proably about 18" of accumulation, and we were playing in it for hours! Had a blast!

 

Anytime cold oil is warmed in a running engine you're going to get condensation. If you drive it farther than the corner store, it will evaporate, if not, you get the milky stuff on the filler cap. Just make sure you don't do a lot of short hops.

A disconnected PCV valve may have an impact on the moisture evaporation in the oil and on the engine cases, but even working perfectly, it won't offset the potential damage of short-hopping the engine.

Moose