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How soon can I sample oil? #4493251
08/19/17 09:40 PM
08/19/17 09:40 PM
Joined: Jan 2010
Posts: 117
Olathe, KS
CARJ Offline OP
CARJ  Offline OP
Joined: Jan 2010
Posts: 117
Olathe, KS
I am having a coolant loss issue on my 4runner and suspect it could be a leaking head gasket. It's only been 550 miles since my last oil change but I want to send a sample off to confirm my suspicions. So, how many miles should I put on the oil before taking the sample?


2004 Toyota 4Runner | 178k | PYB 5w-30
2012 VW Passat | 82k | Castrol Professional 5w-40
Re: How soon can I sample oil? [Re: CARJ] #4493253
08/19/17 09:43 PM
08/19/17 09:43 PM
Joined: Jul 2005
Posts: 30,422
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,422
NY
How much coolant have you lost in 550 miles? If the leak is bad enough and finding its way into the oil 550 miles should be plenty. A very slow leak will probably take more miles to show up.

Another easier and faster way to find out is with a cooling system pressure tester. That will tell you if you have a bad head gasket in a matter of minutes.


God Bless Our Troops

Re: How soon can I sample oil? [Re: CARJ] #4493257
08/19/17 09:48 PM
08/19/17 09:48 PM
Joined: Jan 2010
Posts: 117
Olathe, KS
CARJ Offline OP
CARJ  Offline OP
Joined: Jan 2010
Posts: 117
Olathe, KS
The coolant overflow bottle was empty the other day and I don't think I had topped it off since the oil change. I've tried all the tests and they are negative, but the coolant is still going somewhere. I figured a sample of the oil would tell me one way or the other.

Not sure if it matters, but the 550 miles has taken 6-7 weeks to accumulate. I do a ton of short trips.


2004 Toyota 4Runner | 178k | PYB 5w-30
2012 VW Passat | 82k | Castrol Professional 5w-40
Re: How soon can I sample oil? [Re: CARJ] #4493275
08/19/17 10:34 PM
08/19/17 10:34 PM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
Colorado
Sample now; if it is leaking into the oil it should show up. I had a coolant leak awhile back; Blackstone recommended a 2k OCI until repaired...


Thick vs Thin test: 15k / 43k miles complete
Re: How soon can I sample oil? [Re: CARJ] #4493280
08/19/17 10:46 PM
08/19/17 10:46 PM
Joined: Dec 2005
Posts: 651
Virginia
cpayne5 Offline
cpayne5  Offline
Joined: Dec 2005
Posts: 651
Virginia
V6 4Runner? Been there, done that unfortunately. Mine (2005) failed at only 88k miles. Cylinder six misfire like all the others out there...
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2371546

The numbers in that post are of a sample with 2300 miles on it.

I fixed it six years ago and have put about 40k on the vehicle since with no issues.

Re: How soon can I sample oil? [Re: CARJ] #4493283
08/19/17 10:54 PM
08/19/17 10:54 PM
Joined: Jan 2010
Posts: 117
Olathe, KS
CARJ Offline OP
CARJ  Offline OP
Joined: Jan 2010
Posts: 117
Olathe, KS
Sample I shall. Thanks all.


2004 Toyota 4Runner | 178k | PYB 5w-30
2012 VW Passat | 82k | Castrol Professional 5w-40
Re: How soon can I sample oil? [Re: CARJ] #4493417
08/20/17 07:50 AM
08/20/17 07:50 AM
Joined: Mar 2004
Posts: 20,755
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,755
Upstate NY
A coolant UV dye might be useful also. Also with a UV flashlight and yellow glasses.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: How soon can I sample oil? [Re: CARJ] #4493525
08/20/17 10:15 AM
08/20/17 10:15 AM
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
How much do you want to spend? You can sample every 100 miles if you want to pay for it.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: How soon can I sample oil? [Re: CARJ] #4493580
08/20/17 11:28 AM
08/20/17 11:28 AM
Joined: Dec 2016
Posts: 72
Arizona
DweezilAZ Offline
DweezilAZ  Offline
Joined: Dec 2016
Posts: 72
Arizona
Had mine done on the 86 Olds Calais 2.5 [128,ooo miles] after getting it back from my brother. The sample I sent in was said to have indicators of coolant, but the head gasket had been changed before I bought it.

Blackstone said to sample it again in 1000 miles, as well as change it to be certain the contaminants were completely removed . I only have 100 miles or so on the fresh oil and filter as well as old coolant flush and replacement so CARJ's question is timely.

The odd thing is, I was suspicious of losing coolant back when I first owned the car from 92-99. It seemed to disappear at a slow rate. Parents drove it for six, then little bro for 11, before having to do a head gasket replacement some time in the past year or two.

Sample oil was very black, but the car will be going in for a total mechanical probe in the next couple of weeks.

Thanks for bringing up the question CARJ.


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