AlexHawk94
Newbie
Hello everyone, recently I've already introduced myself in specified thread, if somebody intrested I added a link in the end of this post.
I have 5.7 Vortec 96' Tahoe 5-doors
I did engine replacement recently but seems like I will have to do this again :/
My problem is oil consumption.
It takes 1.5 qrt on 1000 miles. (or 1 litre on 1000 km)
But:
-Engine runs good, it goes fast 0-60 and easy reach 80-100 mph with no problems at all. Power and torque is perfect.
-NO blue smoke when I start engine after long park either short breaks at gas stations.
-NO blue smoke at acceleration.
-Fuel economy is perfect.
-NO knocking.
I think there is no oil leak because everything is clean on asphalt after park under my truck.
I'm using 10-40 Mobil semi-synthetic oil.
Also, I think it's needed to make an important notice:
-I use 10-40 viscosity due to low oil pressure on 5-30. (probably it was a bad oil but I'm scary now of using 5-30)
With 10-40 I stick at 150-200 kpa (20-30 psi) at idle on hot vehicle. It's not constant and can be more or less sometimes, especially at long traffic jams at hot weather. And it stays more constant at warm/cold weather.
I have removed oil cooling lines. Does this effect at oil and reduce pressure at long idle in traffice jams?
Also, I think it would be a good idea to check the oil pump and clean it.
But anyways, what's your idea about oil consumption?
I have new sparks (NGK, correct gap) and just 2k miles on them, do they look like oil burn?
and here i add link to my first introduction thread
http://www.gmt400.com/threads/an-old-chevy-in-russia-yes.38696/
sorry for my weird english, I'm from Russia. It's abit difficult to deal with such vehicles here. Full rebild of GM 5.7 costs here $$ 4000 and takes 3-4 weeks due to parts shipping from USA
P.S.: I have absolutely no idea about how much miles this engine ran for 22 years and was it ever repaired. I'm sure that it has not less than 300-400k mileage
I have 5.7 Vortec 96' Tahoe 5-doors
I did engine replacement recently but seems like I will have to do this again :/
My problem is oil consumption.
It takes 1.5 qrt on 1000 miles. (or 1 litre on 1000 km)
But:
-Engine runs good, it goes fast 0-60 and easy reach 80-100 mph with no problems at all. Power and torque is perfect.
-NO blue smoke when I start engine after long park either short breaks at gas stations.
-NO blue smoke at acceleration.
-Fuel economy is perfect.
-NO knocking.
I think there is no oil leak because everything is clean on asphalt after park under my truck.
I'm using 10-40 Mobil semi-synthetic oil.
Also, I think it's needed to make an important notice:
-I use 10-40 viscosity due to low oil pressure on 5-30. (probably it was a bad oil but I'm scary now of using 5-30)
With 10-40 I stick at 150-200 kpa (20-30 psi) at idle on hot vehicle. It's not constant and can be more or less sometimes, especially at long traffic jams at hot weather. And it stays more constant at warm/cold weather.
I have removed oil cooling lines. Does this effect at oil and reduce pressure at long idle in traffice jams?
Also, I think it would be a good idea to check the oil pump and clean it.
But anyways, what's your idea about oil consumption?
I have new sparks (NGK, correct gap) and just 2k miles on them, do they look like oil burn?
You must be registered for see images attach
and here i add link to my first introduction thread
http://www.gmt400.com/threads/an-old-chevy-in-russia-yes.38696/
sorry for my weird english, I'm from Russia. It's abit difficult to deal with such vehicles here. Full rebild of GM 5.7 costs here $$ 4000 and takes 3-4 weeks due to parts shipping from USA
P.S.: I have absolutely no idea about how much miles this engine ran for 22 years and was it ever repaired. I'm sure that it has not less than 300-400k mileage
Last edited:
but before installing I rebuiled and completely cleaned intake manifold, replaced all intake gaskets, installed new fuel injector, replaced thermostat, pcv valve and something more. but i didn't do rering, rebore and etc...
