How long would you leave this oil in the engine?

[PT1]

Just had my GMC in the dealer to deal with the famous cold start tick. They decarbonized the throttle body telling me it was "carbon knock". Kept it overnight...next morning still ticking. So they removed the spark plugs and filled the cylinders with top end cleaner and let it soak 12 hours. started it up and blew out more gunk. Kept it overnight....next morning still ticking. Next they cleaned the fuel injectors...kept it again still ticking. After all that they changed the oil to a fresh fill of Mobil1 with filter and gave me a letter from GM extending my engine warranty to 100,000 miles.

SO the big question is...after all that solvent and cleaner...how long would you run this Mobil1? I am tempted to go about 500 miles and change it again. What say all you experts?

 

[SrDriver]

Would not hurt anything and I would do the same thing.

 

[addyguy]

They put the oil in after they did all the cleaning, so why would you not run it the 'full amount' you usually would? Its fresh oil, and all the cleaners and junk came out with the old oil, so there 'shouldn't' be any contamination you have to worry about.... so a 500 mile run of fresh M1 seems like a heck of a waste....just my 2 cents....

 

[Pablo]

There probably isn't a ton of stuff in the oil at this point....I would go a few thousand miles max. It's your gut.

Dang. It must be clean. I guess.

 

[slipperysam]

It is a rare GM engine that doesn't tick. It is lifter noise
and not much you can really do about it. That said, many of these GM engines last a very long time. It really is more of an annoyance than anything else. Even my Hondas have a slight tick but it is from injectors and I have learned to live with it.
Use the oils spec'd out in your owners manual and follow the service schedule. you'll do fine !

SS

2000 Honda Accord 3.0
2004 Honda Pilot 3.5
Mobil Clean 5000 / Pure One

 

[ThirdeYe]

Originally Posted By: slipperysam
It is a rare GM engine that doesn't tick. It is lifter noise
and not much you can really do about it. That said, many of these GM engines last a very long time. It really is more of an annoyance than anything else. Even my Hondas have a slight tick but it is from injectors and I have learned to live with it.
Use the oils spec'd out in your owners manual and follow the service schedule. you'll do fine !

SS

2000 Honda Accord 3.0
2004 Honda Pilot 3.5
Mobil Clean 5000 / Pure One


Actually it's not the lifters, isn't it usually piston slap?

 

[Dyoel182]

If its not the lifters you mean?

 

[PT1]

Originally Posted By: ThirdeYe
Originally Posted By: slipperysam
It is a rare GM engine that doesn't tick. It is lifter noise
and not much you can really do about it. That said, many of these GM engines last a very long time. It really is more of an annoyance than anything else. Even my Hondas have a slight tick but it is from injectors and I have learned to live with it.
Use the oils spec'd out in your owners manual and follow the service schedule. you'll do fine !

SS

2000 Honda Accord 3.0
2004 Honda Pilot 3.5
Mobil Clean 5000 / Pure One


Actually it's not the lifters, isn't it usually piston slap?


That was my initial feeling but they put a steathascope on the engine at cold start and it is definitely lifters. They took 4 days to rule out piston slap because this service manager really wanted to know because this is a new GMC franchise and my truck is the first one they have dealt with. They did tell me that if it were piston slap they would have replaced all the pistons and rods with those new Federal Mogul pistons that have a moly coating on the skirts.

 

[PT1]

Originally Posted By: Pablo


Dang. It must be clean. I guess.

It runs like brand new and idles so quiet you can barely tell it is running. Seems like about 10% more power too.

 

[Titan]

"They all make that noise. Besides, I don't hear any noise."

 

[Squishy]

Every GM I've driven over 80,000 km or so have made that noise. Doesn't seem to hurt engine longevity any - several have made it past 300,000 km, and it was the bodies that rusted out or transmissions that failed.

I always believed it was lifter noise - is it a general concensus that the "GM tick" is normally piston slap?

 

[mcrn]

One thing is for sure, it sounds like you found a great dealer!

 

[PT1]

Originally Posted By: mcrn
One thing is for sure, it sounds like you found a great dealer!


That is for sure!!! AND I didn't buy the truck from them!

 

[oilboy123]

Run a Auto-RX maintenance dose to keep the carbon at bay. Just a thought.
It helped my carbon prone Ford vulcan engine a lot.

 

[PT1]

Originally Posted By: oilboy123
Run a Auto-RX maintenance dose to keep the carbon at bay. Just a thought.
It helped my carbon prone Ford vulcan engine a lot.


The carbon build up is in the intake system and upper cylinder combustion chamber. Will auto-rx really do much there?

 

[PT1]

Just to follow up on this thread. Pulled the dipstick at 200 miles and it was already black.

..changed out the M-1 at 250 miles and it was nasty looking. The oil in the drain pan still smelled like GM top end cleaner.

 

[Dyoel182]

Originally Posted By: PT1

The carbon build up is in the intake system and upper cylinder combustion chamber. Will auto-rx really do much there?


Sure wouldnt.

 

[Turk]

Wow - already black. Good checking.

I'd monitor it frequently & go from there. You should be able to go 3k on the subsequent run...

 

[Gary Allan]

Originally Posted By: Dyoel182
Originally Posted By: PT1

The carbon build up is in the intake system and upper cylinder combustion chamber. Will auto-rx really do much there?


Sure wouldnt.


I imagine that if you had some increased blow-by due to poorer ring seal ..that ARX would reduce it and therefore reduce some of the non-fuel related deposits that may find their way into the combustion chambers.

..but generally, I'd agree. A good top end cleaner would take care of it directly and not in some secondary manner.