Had to start my truck after setting in -5 degree weather for 13 hours on Thursday. Happened to look under it today and saw that the cold weather must have caused excessive oil pressure and caused a leak in the oil filter gasket area. Not too big, but there was a puddle under the truck. Went ahead and changed to Amsoil oil and filter. Hope that solves the problem.

Happened twice to me already, Had it towed to dealer both times. Dealer states GM is working on a revise that block heater will be needed anytime below 20*F

What oil do both of you run? Possible a 5W syn will prevent this?

Had not changed it yet. Do now have Amsoil.

My truck did this here in Dallas TX when it was only in the 30's. Dropped only enough oil to make a "saucer plate" sized puddle on the ground when I had it warming up for 10 minutes. It did not do it again after it warmed up. I am running the AC Delco filter tightened per specs, and Mobil Delvac 1300 super 15w-40. I think the high oil pressure when it's first started and the oil is very thick overcomes the O-ring on the oil filter and allows some oil to get passed it.



Had to start my truck after setting in -5 degree weather for 13 hours on Thursday. Happened to look under it today and saw that the cold weather must have caused excessive oil pressure and caused a leak in the oil filter gasket area. Not too big, but there was a puddle under the truck. Went ahead and changed to Amsoil oil and filter. Hope that solves the problem.

There shouldn't be any blow-by at the o-ring at any temperature. I run 15W-40 all year round and have temps well below 0*F for long periods of time as well as having high starting pressures and I've never had leaks. Sounds like the filter is either not tight enough or maybe a small amount of dirt between the mating surfaces. When you put the filter on do you run a small amount of oil around the rubber gasket on the filter? Also clean the filter housing with a clean rag before re-installing the filter.

Some of us like not having to use a filter wrench to remove the filter. If it is cold enough, with a dirty filter, it is very easy to blow the O-ring, it happened to me once a long time ago, lost all the oil, yuk.

I routinely hand tighten filters, and I noticed a little oil (drops) recently. This rig may just develop more pressure than we have dealt with before.

First time stock factory installed filter, Second time AC Delco filter with Delvac 1. BTW Both times on mine the filters splint when going to high idle at warm up. Around 0* to 5*F

It was the orginal filter and oil

When it gets really cold thing contract. Years ago I bought a new 89 Chevy 1/2 ton. The month was Sept. All was well until one really cold Dec. morn. Had antifreeze leaking out of several hoses. This was the only truck I ever bought with real hose clamps. Each one was one full turn lose. Later! Frank

Anytime it's going below 25F my truck gets 2 hours morning block and oil preheat. Truck starts right up and has instant almost normal oil pressure. Has to be better than just a block heat IMHO. No oil leaks yet but truck only sits 4-5 hours tops during the day and daytime temps have not hit the single digits. Currently run Rotella 15w40. definitely something to keep in mind as temps get lower. Thanks for the info.

First time I started mine in sub-zero temps the oil pressure went over past 100 psi at idle and stayed there for several minutes. Didn't leak any oil past the filter (I had 15W40 Delvac in it) but I stopped at WalMart on the way home and picked up some Mobil 1 5W40 and changed when I got home. Cold start oil pressure is more normal now, and hot pressure was not affected.

Much better on the motor, slows down the cold start damage. Lower pressure=higher oil flow. Much higher.