Cold Engine Noise

**wnmech** · 12-01-2006, 05:08 AM

My car sat for a couple of days and this morning I started it up and for a second or two it sounded like a diesel engine and then quieted down to normal. Our outside temp was around 20 degrees and icy conditions. I am using castrol 10-30 oil in the car and doing an oil change today. Is this sound normal for these engines for extremely cold weather and what weight of oil should be used in this engine? Thanks for the help.

**PontiacFan** · 12-01-2006, 06:05 AM

5w-30 I believe is what the factory calls for.
The diesel sound was probably piston slap, & possibly valvetrain noise.
http://www.pistonslap.com/

**nhraformula** · 12-01-2006, 09:47 AM

ill bet its piston slap. its nothing to worry about

**cheviz28** · 12-01-2006, 10:05 AM

I think that's are the Hydrolifter. If the engine run and there are fillied with oil the noise is gone. But it's normal
I drive an 30W50 Race Oil from Motul. No more noises in cold run. But the oil is not good for winter.

**TrifectaPerformance** · 12-05-2006, 12:03 AM

My car does it too.

I read an article in HotRod about this very issue today. The article said that GM uses fast bleed-down lifters in the LS1 to reduce emissions. This apparently can cause cold-start lifter noise.

They also said there can be piston slap from an engine that was on the loose side with regards to piston-to-wall clearance.

In either case, the article said that they agree with GM in that neither one of these issues should be considered a problem.

That's of course, assuming, the problem you're describing is the same as the one described in the article.

**Too Fast** · 12-05-2006, 02:43 AM

Yes, use a good 5w30 synthetic. Not 10w.

**Tyler_LS1** · 12-05-2006, 08:16 AM

Originally Posted by TrifectaPerformance

My car does it too.

I read an article in HotRod about this very issue today. The article said that GM uses fast bleed-down lifters in the LS1 to reduce emissions. This apparently can cause cold-start lifter noise.

They also said there can be piston slap from an engine that was on the loose side with regards to piston-to-wall clearance.

In either case, the article said that they agree with GM in that neither one of these issues should be considered a problem.

That's of course, assuming, the problem you're describing is the same as the one described in the article.

that is one of the better explanations.

**cheviz28** · 12-05-2006, 10:22 AM

He Boys i wrote shit. I use Motul Competition V300 15W50

**Too Fast** · 12-05-2006, 03:51 PM

Originally Posted by cheviz28

He Boys i wrote shit. I use Motul Competition V300 15W50

Why do you use such a heavy weight oil? Are you constantly going 150 MPH on the autobahn? Even then, 15W50 = not good for the LS1.............

**cheviz28** · 12-06-2006, 09:34 AM

Originally Posted by Too Fast

Why do you use such a heavy weight oil? Are you constantly going 150 MPH on the autobahn? Even then, 15W50 = not good for the LS1.............

No problem, it works good. My budy has an garage for us cars and ls1 tunning only, he said it goes, spezial for ls1. It will also used in ferrari engines and porsche for example too.
In case of an motordamage i just kill him

joke

**cheviz28** · 12-06-2006, 09:37 AM

Oh btw, i like to drive fast on the autobahn, but the autobahn is not free all the time, big traffic

Greetz, Ralf

**Too Fast** · 12-06-2006, 04:18 PM

I have heard about the traffic problems getting worse on the autobahn. So, have you had your Z up to 160 MPH yet? Do your fellow Deutchmen know what kind of car it is you drive? Especially when you blow by (most) of them on the autobahn.

**cheviz28** · 12-06-2006, 10:07 PM

Yep one time i drive the Z about 165 MPH ,its around 260 KMH, on the autobahn, but only for a couple of miles, then i must brake for an fucking mercedes. I think the Z goes around 170 MPH. I will test it next year. The Z makes a wintersleep till april. Most poeple did'nt know the Camaro and his power. Sometimes its war on the fucking autobahn. A VW, Opel or Ford Driver makes no big problmes, but you drive behind a BMW or Mercedes or Audi just about 220 KMH and they dont let you passing by. The drivers think the autobahn is his property. They want belive that an american car can goes faster as theirs.
Becuase its always great to look this drivers in the eyes, if you drive them fast away

nice to talk with you, greetz Ralf