Sludged engine help ( I know dead horse), but confused)

[jssaab]

Thanks the 0W-30 is specified and those GM specs are correct. M1 ESP meets those specs and I had 250K miles on my strong running 9-5 (with 330 HP tune) until I hit a deer.... Just a little varnish on the engine, did not burn a drop in 5K OCI

 

[jssaab]

Thanks the 0W-30 is specified and those GM specs are correct. M1 ESP meets those specs and I had 250K miles on my strong running 9-5 (with 330 HP tune) until I hit a deer.... Just a little varnish on the engine, did not burn a drop in 5K OCI