Just noticed the other day I have a pretty good leak start extrenally on the motor of my bonneville and was wondering how can I tell if its mixing with my oil? Because if I can just keep and eye on it and do intake gaskets in the spring that would be much better (no garage) lol

please let me know, thanks!

If its mixing with your oil, your oil will look like chocolate milk.

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Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

You should really check to see where it is leaking from. On those, it is very rare for a LIM/UIM gasket to leak externally. You may have something as simple as a hose or fitting broken.

Also, remember that when something is leaking, it is only getting worse!

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~Randall~


1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place

Appreciated the quick response guys! Now the upper intake (plastic part) does any coolant run threw that or is it just air?

Thanks again guys!

Appreciated the quick response guys! Now the upper intake (plastic part) does any coolant run threw that or is it just air?

Thanks again guys!

Yes, coolant does run through the UIM as well. That actually is the biggest point of failure. Usually when they fail, the passage is broken down by the heat of the EGR pipe, and causes the manifold to leak coolant directly in to the air intake path (coolant gets sucked in with air).

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~Randall~


1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place

Check inside you engine oil fill cap to see if there foamy white/creamy coolered stuff in there.

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l67 swap; 3'DP, power log, CAI, 10.5 wires, 3.5" pulley, autolite 104s, canned tune, 180 thermo, 2 Alpine type Xs, ARC Audio XDi 2000, Big three-0/1 , couple Red Tops, alpine x303, cleared lights, custom trunk.

oil appears to be perfectly fine! now I cant exactly figure out where the leak is comming from .. any suggestions would be really appreciated. Ill look it over more today when I get the chance, Im just glad to find out anti-freeze isnt getting in my oil. one question I do have is the other day when I had the engine cover off I noticed in the slots (on top of the intake) there was puddles of coolant up there. should I plan in replacing the upper intake right off the bat?

Thanks a lot guys!
Tony

If you haven't changed them yet, I would definitely suggest it. If the coolant hasn't started mixing, it will sooner or later.

Seems the Lower intake manifold gaskets are leaking externally, they and the plenum need to be replaced.

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Bye Bye:

RIP sandrock