97 Chev Blazer V-6, Any oil related issues??

[Fuelman]

Just bought a used 97 Blazer with V-6, auto, 4x4 with 100K on it.
I changed the oil to one of my favorites, Citgo 5W-30 from the valvoline 10W-30 that was in there year round according to previous owner. He did routine 3K OCI's and never indicated a problem. Regular 30K ATF Flushes, without filter swaps I assume since it was all done by a quick change place.

First, Does anybody have any knowledge of these things having any oil related problems like sludge or breaking down the oil fast or anything like that. Same thing with the ATF, any issues to be aware of that could be solved with good lubes?

I intend to leave this a dino oil vehicle and use my dino standbys of either Citgo, Havoline or Chevron, and do 3K OCI's since this vehicle will do a million short trips a year without getting warmed up.

Thanks for any knowledge in advance.

 

[Drew99GT]

The main thing to look out for is an internally leaking intake manifold gasket where coolent will conatminate the oil. You may want to have a cooling system pressure check and have it looked at in addition to having an oil sample analyzed to see if any coolent is present.

 

[JHZR2]

there is a chance that you may have a small intake manifold gasket leak, which could put some coolant in the oil.

Also, be sure to go to the auto parts store and buy the stant brand radiator cap - it will help get rid of chances of air in the coolant, causing clogs and breakdown of the coolant. Also, Please get the coolant replaced - some folks dont service dex-cool as often as they should.

Other than that, the engine is really tough, the vehicle will last and last, the drivetrain is bulletproof.

Good luck,

JMH

 

[davidfarming]

I have had a 1989 Blazer since new. It has the 4.3. It is now approaching 200k. Up until 140,000, I used Havoline 10-30. Now I have been using MaxLife. I have had no problems with the drivetrain. I have also done OCI of 3k.