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1998 Honda Civic coolant in oil - 98 Civic

Tiny
CYBERWATSON
  • MEMBER
  • 1998 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
I have a 98 civic with 170K on it. Have run Mobil one in it since I got it about 1.5 years ago. Recently developed an oil leak. Oil was normal color. Switched to Quaker State oil for High Mileage cars. Have run it for a few thousand miles and noticed lower gas mileage than before (from 35mpf to 30mpg). Two weeks ago, I noticed coolant in an oil spot under the car. I pulled it back into the garage and have not driven it since (been out of the country). I did notice another oil spot with coolant in it when I checked before the trip. I tend to drive easily; trying to maximize fuel mileage. I would appreciate any thoughts on this. Thanks
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Saturday, January 17th, 2009 AT 2:15 AM

3 Replies

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Do a compression check on the cooling system. If the system looses pressure then that will show you that you have a leak.
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Sunday, January 18th, 2009 AT 12:00 AM
Tiny
CYBERWATSON
  • MEMBER
  • 5 POSTS
Thanks. Will try to get the tool to do the compression test on the cooling system today. Is it possible since I switched from Mobil One to a heavier oil that the spot is actually lighter oil mixed in with the heavier oil instead of coolant mixed with oil? Just a thought I had about it as I was travelling. Thank you
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Sunday, January 18th, 2009 AT 6:32 AM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
I don't know how the oils mix, but you will be able to smell it if it is anti freeze. You will find that the anti freeze will leave a film on top.
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Monday, January 19th, 2009 AT 7:15 AM

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