Originally Posted by Wtd85

After reading thru this thread I think I probably found my problem. Would this also let oil into the coolant?

Originally Posted by Sonocativo

I doubt it unless the intake gasket has blown out at the coolant port, Oil in the coolant sounds more like a head gasket? How is the oil when you pull the dipstick?

Originally Posted by HeyYou

I'm not sure it's even possible for oil to get into the coolant.... the oil passages are far away from any coolant passages, and even those, aren't pressurized. Oil in coolant is likely trans fluid......

Originally Posted by Sonocativo

I recently replaced my plenum gasket, it was blown in 6 spots, pinged like a **** ! I bought the truck used and the guy told me he had a tuner and lost it so it stuck to run on premium gas.... I didn't think at the time to check the plenum as it was raining cats n dogs. But since changing it the pinging has stopped, more responsive when I get on it, I went from 200 per tank of gas to 350 ( I haven't did the math yet for actual MPG ) new plugs, wires, cap and rotor as well as TPS since the old one broke unplugging it. Fresh oil with seafoam to clean out all the gunk in the block as the plenum was caked in carbon. All the sparkplugs that came out were various brands... that idiot doesn't need another vehicle. Other things Ive done was all new shocks, tires, damper.. making it mine.
Heat wasn't working well, replaced water pump... Then found the thermostat was crudded up and so much gasket maker the guy used, just crazy. So corrected it all while doing the plenum.

Originally Posted by Sonocativo

if you look at the pictures, you can see the coolant ports ( small ports ) and the intake ports (large ports)

Originally Posted by HeyYou

But they are a pretty far distance apart, and the cooling system will be under pressure, any oil there, will not be...... You can get coolant in the oil from leaks at those ports, but, oil will never find its way into the cooling system.

I would be real tempted to pull the trans dipstick, and see what THAT fluid looks like....

Of course, it may just be some crap a previous owner dumped in there too.

Originally Posted by Sonocativo

That's why I say its probly more of a head gasket to get oil in coolant.

Originally Posted by HeyYou

No pressurized oil flows thru the head gasket either.......