So i stored my 05 4.8l silverado at my shop for the winter , but i did pull it in and out in the beginning and end of each day so short running periods. But i checked the oil yesterday and it was like a milk shake, didnt look like coolant mixed but definitely a lot of moisture. Any idea how something like that happens? I will try to post a pic. The truck has 130k i am secind owner the first owner was my boss who took extremely good care of it , synthetics since new etc. And i changed the oil right before winter with valvoline full synthetic and a fram gold filter , i forgot what they call it.i drained it changed the filter and put conventional oil in yesterday to do a quick flush before i put the expensive synthetic bach in. Any suggestions appreciated
Thanks

 

I did add some heet to the empty tank of gas before storage, so maybe a weird reaction from that? I put some in a clear cup and let it sit overnight and there is no separation at all , it literally looks like coffee with creamer added

 

It won't seperate if you just let it sit, you'd have to stick it in a metal can and take a propane torch and heat it up. The water would boil off.


How does the oil look after adding new oil to it and running it for a while??

Figure short run times plus it being in a warm shop everynight and then letting it sit out and then bringing it back inside will allow tons of moisture build up on the inside of the block and that will just run down into the oil and mix with it.

 

Oil looks fine now , i was thinking the same thing but seemed excessive.
Thanks

 

Yeah, for future storage purposes, the engine has to reach operating temperature then stay there for 10 minutes to dehumidify the block. Otherwise every short run cycle will pull fresh, humid air into the block and condensate it as the block cools.

 

Gotcha, thanks!