I bought a 98 Dodge Ram with the 5.9. It has 65,000 miles on it. I changed the oil in it when I bough it. I put in a synthetic blend oil, quaker state 4x4 and suv. Then one morning when it started it, and a cloud of blue smoke came out from the back of the truck. It’s mainly when I start it up, after it warms up its fine. Now it seems to do this more often now. I did over fill it a little but drained it to the correct level. I don't know what the problem might be? I duuno if the valves need to seat with the new oil, or if the is a gasket that went because of the different oil? Please help

 

the valve seals in the heads are supposed to be pretty good, I had 150k on mine before I swapped them out for the RT's and it still was not leaking any oil past the seals...

check your plenum gasket for leakage. look down the throttle body and see if you can see any oil pooling on the inside of the intake manifold. this is a common failure but I have not heard of it showing up as blue smoke at startup, usually you'll find oil on the plugs in sever cases, pinging and poor gas milage.

 

OKay,

I'm may be completely wrong on this, so sorry if I am, but...

I think you cannot put synthetic in a vehicle with over 50K if it had regular oil in it before.

Synthetic has more 'cleaners/detergents' than regular, and I believe what happens is that it's burning old oil build-up. That would explain the blus smoke, oil buening off. The other issue it can cause it leaking around seals and gaskets. You take an engine that may be in great shape, but probably has some oild build-up, and suddenly clean it, it can cause some issues.

Hopefully, that's not it, but it could be part of it.

 

Yea I think it is the intake gasket. I drove it the other day. It was getting bad fuel mileage. Also it used about a 1/4-1/2 quart of oil in a 70-80 mile trip.

 

I bought my truck with 121k miles on it and my 1st oil change was to Mobil 1 15w50, never a leak of any kind and it runs awesome still with over 154k miles on it. I did however change the front seal as a maintenance item when I had the timing cover off. the old one was not leaking.

the inside of my motor was very clean using the mobil 1 oil... switching is not a problem from my point of view... I have done the change several times now on my cars and all of them had no issues with leaking

 

HAD 65000 ON MINE AND CHANGED OVER TO SYNTHETIC THANX TO THE GUYS ON HERE AND IT HAS BEEN FINE EVER SINCE.....SO I DONT REALLY THINK IT MATTERS HOW MANY MILES ARE ON THEM BUT THE CHOICE IS ALL YOURS!!!!!

 

I snagged this from the oil bible site and it dealt more with using a flushing chemical to remove build up.



In an old engine you really don't want to remove all the deposits. Some of these deposits help seal rings, lifters and even some of the flanges between the heads, covers, pan and the block, where the gaskets are thin. I have heard of engines with over 280,000km that worked fine, but when flushed it failed in a month because the blow-by past the scraper ring(now really clean)contaminated the oil and screwed the rod bearings.


Heres the site its pretty cool...

http://www.chris-longhurst.com/carbi...oil_bible.html

But I find it ironic that after a oil change it blows blue smoke so heres my take. Pick a choice.

1. The guy you bought it from dumped a $hit load of a NO-Smoke additive in it so that it didnt smoke when you bought it. Now that you changed your oil the product is no longer in there and its smoking.

2. The new oil cleaned some build up off the heads or around the valve seals and its letting some oil into the chamber..

3. Check plenum gasket for leaks as mentioned above.

4. It just started to wear out on your shift.



So here's what I would do.

Try a new oil for older cars or buy a can of that no smoke stuff and dump it in.

Be advised that the no smoke stuff thickens your oil and is not really a good fix but if it makes you feel better the stuff is cheap and you could add one every oil change.

Or if you have some cash think about some new heads. Might be a nice time to get some heads that give you more HP.

As a last resort you could just drive it till it has a bigger problem.

There is no easy cheap answer Im afraid.

Goodluck