Hello guys, my name is David and I'm new here so it'll take me a bit to get used to the forum. I have a 94 xlt 4.9 with around 330,000 miles. I traded for it a couple months back. Has been driven daily, about 16 to 20 miles a day. I haven't had ANY trouble at all out of it except small nitpick things. Until now. I changed the oil in it this morning. The oil looked ok when I got it and it had a brand new filter (microgaurd). Today I used the O'Reilly brand high mileage 10w30 (5 quarts) and a new microgaurd filter along with the PCV vavle. When I started the truck, the entire area looked like the truck was on fire. I couldn't see for the white smoke. Checked the oil and I didn't even have any on the stick..... Anyone have any ideas why this would happen immediately after changing the oil?

Thanks in advance

 

This is strange. I only use Motorcraft parts in my 4.9L. I have read on this Forum, you should use only Motorcraft PCV valves. I also only use Motorcraft FL1 oil filters i buy at Walmart.

I would start by changing your PCV valve to a Motorcraft, but i'm no expert.

 

Well see, I thought that the PCV may have been a bad one so I put the Motorcraft back in with no change. I'm leaning towards something wrong with the rings. I can put my hand over the tailpipe and it doesn't build any pressure much. It never tries to blow my hand off.

 

I don't know why changing the oil would do that. I have to assume you put enough oil in it and that you put everything back together right. So there's no real good reason for that, unless it's a different unrelated problem and the timing is coincidental.
Usually you can tell a lot from the colour of the smoke coming out of the tailpipe. Black would be excess fuel, blue would be burning oil, white would be coolant.
Sure you just didn't spill oil on the manifolds ?

 

I have no idea why it would just start. I drove it Friday, changed the oil and bam. It's definitely oil, you can smell it. I put 5 quarts in and now the stick is dry when I check it so I know now it's 2 quarts at least low. This is not spilled on the exhaust manifold smoke, this is pouring out the tailpipe and smoking up the neighborhood in a few minutes.

 

The only logical explanation would be that the engine was doped up to conceal the oil burning problem. But I have never found anything that was that great at stopping oil burning.

How much oil had it consumed in the amount of time you had it? How many miles?

 

I checked a week ago and it was a little more than a quart low. According to the trip (I reset it the day I got it) around 1200 miles

 

Sounds like the seller did something to hide a major problem.



If you ever figure out what happened, be sure to post back and tell us what it was.

 

I don't know what to say. You could try adding a couple quarts of Lucas oil stabilizer, but I Don't know if that would even make it slow down the oil consumption enough to make it practical to drive.

Your truck should take six quarts of oil, instead of five.

 

I wonder if they may have been using something like Rotella and maybe a quart of Lucas. I did notice that when I start it, the mains would rattle for a second or two before the oil pressure guage picked up. I haven't drive it but once, today to take off trash. I didn't pay attention to see if it still rattled on start up. I did notice it didn't smoke much today until I got on the highway, then it started pretty good.