Coolant in oil

VISTA

MEMBER
1998 JAGUAR XJR
4.0L
V8
RWD
AUTOMATIC
120,000 MILES

Was running a little rough plus the heater would get cool from time to time and would overheat when I would really get on the accelerator. Coolant would fill the over flow tank and leak out the hose. So I changed the thermostat, drained and replaced the coolant. I replaced the spark plugs, spark plug tube seals and valve cover gaskets. Went to drain the oil and had some coolant come out before I seen oil drain out. I have not ran the engine since I found coolant when draining the oil. Before this over heating problem the car ran great and is in excellent condition. The engine is supercharged. Any help would be awesome. Thanks

5 Replies

HMAC300

MECHANIC
48,601 POSTS

Pressure check coolant system with a pressure checker for a blown head gasket. There is also a chemical additive that detect head gasket problem, but it sounds like that is the problem.

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Friday, April 14th, 2017 AT 7:44 AM

VISTA

MEMBER
3 POSTS

Can I just do the pressure check or do I need the additive also?

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Friday, April 14th, 2017 AT 9:38 PM

HMAC300

MECHANIC
48,601 POSTS

You can either one you want if one doesn't show any thing then the other will it can also be a broken cooler line in radiator for transmission or if you have an oil cooler in radiator it could be that as well.

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Saturday, April 15th, 2017 AT 6:16 AM

VISTA

MEMBER
3 POSTS

Ok. Thks

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Tuesday, April 18th, 2017 AT 8:17 PM

KEN L

MASTER CERTIFIED MECHANIC
47,490 POSTS

Hello,

Here is a guide that can help.

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

Please let us know what happens.

Best, Ken