So at about 102K miles our I4 Terrain meets GM's spec for excessive oil consumption. Unfortunately the time limit for the 7-year excessive oil consumption warranty has expired, but not the miles (120K in bulletin 15285). I opened a case with GM and dealer was able to have GM agree to pay for about 1/2 of the repair for about $1500.
Has anyone else had this "kit" service done on their I4 Terrain or Equinox and how well did the engine run afterward? I understand other parts including the timing chain are replaced besides the pistons and rings. What are your thoughts about spending $1500 on this repair vs. just keep adding oil when needed. I'm pretty sure we want to keep the Terrain for another year and I'm also thinking it could help with resale if the job was done.
I appreciate your thoughts. Thanks.
My Equinox was serviced in December. Mine was under warranty so I did some extra work to the head to include cleaning grinding the valves. What is your consumption? Is it way above or just met the 1qt/2k miles. I have heard some people with older Ecotec engines, soak the cylinders over night with strong solvent to loosen up the carbon and varnish around the rings, siphon it out, drain and flush the oil and then, run it high speed (WOT) on the highway to free up the rings. Sometimes this works.
If your timing chains are noisy at idle, their time is limited. $1500 is good deal, the chain replacement alone can cost at least $1k. Your 2011 should be checked and I would ask them to replace the HP fuel pump.
The exhaust manifold is known to crack over the years. Mine was cracked as others predicted. It had not started to rattle, but it was just a matter of time. One exhaust bolt was broken and missing. I would have them check before tearing the head off. Cost is $150 and a gasket.
I would have them do compression and leak down test to determine if there are other potential problems down the road. Does not make sense to fix the rings, just to have valves begin to leak shortly there afterward. Exhaust valves on mine showed pitting after only 90K. As I said I had the head cleaned and services for about $300 dollars and the dealer re-installed when I brought it back. Save a bunch of money.
The piston/ring kit includes valves stem seals. I would ask them to replace as these are also a source of oil consumption. They may try to get you to pay more but I would argue it.
Have them take detailed pictures of the cylinder walls, and the connecting rod bearings. If there scoring or excessive wear in the cylinders, then they will replace the engines. Same for the bearings, only slight wear is allowed, otherwise replacement is included.
Once complete, I would change the oil after 1000 miles, and again at 3000 miles to get rid of the wear metals in the oil. After about 4-5k miles the rings and cylinders should be seated or worn in to properly seal the cylinders. Until that time I was still seeing some oil and water build-up in the PCV system from blow-by. Waiting for this winter to see if there is an improvement.
This will definitely help with re-sale value, but only for a private sale. Keep all your records.