Knock when cold

[rdezs]

.... And I'm sure there's a joke in here somewhere about short skirts? LOL

 

[j91z28d1]

the e38 ecm actually has tables and settings to try and address piston slap. I'm not going to pretend to know what it does, but they are there and labeled something about piston slap.

my guess that's slow why they switched to a injector closing time strategy from opening time on the Gen 3 ecm's.

 

[Marky Dissod]

Have 02 Yukon that has piston slap since new. Tried to get warranted when new, no go.

Too bad GM were building the rest of the engine so well that apparently the piston slap wasn't enough to wear those engines out sooner.

I have tried different weights of oil, and the one that works best (least noise and quickest slap stop) is 5W30 semi synthetic.

Brand of oil, or specific flavor of brand of oil, makes no difference? ANY GroupIII 5W30?

No matter what motor oil I've tried, 1st min of every winter cold start outside, lil bit of piston slap.
0W30 or 5W30 Valvoline, preferably Restore & Protect, with a Purolator PBL 25288 or Mobil1 206.
If I drive like my right foot is broken for the 1st min, only I can detect the piston slap.

 

[Blackcar]

Too bad GM were building the rest of the engine so well that apparently the piston slap wasn't enough to wear those engines out sooner.Brand of oil, or specific flavor of brand of oil, makes no difference? ANY GroupIII 5W30?

No matter what motor oil I've tried, 1st min of every winter cold start outside, lil bit of piston slap.
0W30 or 5W30 Valvoline, preferably Restore & Protect, with a Purolator PBL 25288 or Mobil1 206.
If I drive like my right foot is broken for the 1st min, only I can detect the piston slap.

I use Pennzoil but the semi synthetic is hard to find so probably will go to full synthetic.
I have enough semi for about four more oil changes. I also use AC oil filters my 02 has 65000 miles on it now.

 

[Denalibro76]

L9H is free of any and all Engine Half@$$ hardware or software bullschidt.

Cap'n Obvious says:
Engine'll likely last longer and age more gracefully if you don't move out of park for a min after starting it,
and drive as gently as reasonably possible for the next five or six min.

Cap'n Obvious might not know that, if you choose the right motor oil and oil filter,
it might actually help minimize piston slap over and above driving gently til it warms up.

Yeah I always let idle for 10 minutes or so before I drive in the winter here. What’s the “right” oil and filter?