I recently lost another turbo. The dealer replaced it under warranty but do not seem concerned about the cause.
I took an oil sample to a local CAT lab. the oil had 1800 miles and had 4 qts added as result of the failed turbo.
The sample came back with a viscosity of 9.8 the original oil was 10w30 motorcraft blend
the lab said that it appears there is fuel in the oil
1 dealership says this is normal
another dealership says bring it in they will pressure test the injectors and do another oil sample test.
This may be the reason I have had 3 turbo fails in last 2 years.
Any input from readers of this would be helpful
Tell us how much fuel was in the oil - specific info helps in diagnosing the problem. Did you sample the oil after 10-15 minutes of highway driving - after the oil system had been at "operating temperature" for awhile?
Also - 9.8 cstokes is pretty low viscosity - almost a 20 weight. How long between oil changes? ..... and also I assume that the 10w-30 oil you used was a CI-4 or a CJ4 oil?
With all your past turbo problems, I would consider using a synthetic oil for the increased temperature range performance. Also, I believe there is an upgrade to the turbo oil drain line, but you may have it already. Probably worth asking about.
Just a couple of "off-the-wall" questions - If you do have significant fuel dilution, are you using any fuel additives? Are you using OEM oil filters?
Diesel getting into the oil (causes):
- Injector o-rings
- Copper washers in the injectors
- An internal o-ring
- The plunger and barrel is worn past the point of the bypass not being able to keep up with the leakage (mostly associated w/ WVO operation)
How to determine which injector is leaking fuel into the oil:
You put UV dye in the fuel bowl and disconnect one side at a time and watch the oil drain for UV dye. After you determine which side is leaking, pull the valve cover on that side, do the UV dye again to find which injector its leaking around and replace those o-rings. Its a pain, and most of the cheap UV dye kits you buy have crappy lights which don't work well, the good ones are several hundred $$$.