Why does the 4.3l use 5w-30 oil and the 5.3l use 0w-20?

[customboss]

0.5% fuels in oil max is what is recommended and ideal.  5% -10+% fuel in oil is harmful and using NORMAL methods of maintaining Dizzy YOU  allowed it to gum up and would have failed if not for  elemental #'s on PAPER results to guide you to repairing.  

 

VVT commentary for engines that use it.  DI same, cam phasing same.  

 

Stribeck curves......LOL   How many Stribeck curves of your lubricants have you studied with 10% fuels dilution?  

 

Don't answer. I won't follow up as this is not helping anyone reading including you. 

 

 

 

 

 

 

 

 

[diyer2]

23 hours ago, KARNUT said:

My 2 cents. I appreciate the knowledge of the banter. Following Grump's threads with the results accomplished especially with the problem engine. I would lean toward his conclusions. The paper analysis makes my head hurt. I can’t drive paper. 

I'm with you Karnut. 

IMO Grumpy's problem motor may have been OK with shorter OCI's, I believe he did 5k OCI's. If my memory serves me right the same OCI my son used on the same motor with the same result. 

[customboss]

5 minutes ago, diyer2 said:

I'm with you Karnut. 

IMO Grumpy's problem motor may have been OK with shorter OCI's, I believe he did 5k OCI's. If my memory serves me right the same OCI my son used on the same motor with the same result. 

Problems with Dizzy would have been masked with shorter intervals.

 

Gasoline induced shellac forms from nitration affects literally in 1000 miles or less.  That shellac will drive a DI engine to form varnish because of heat and pressures and fine soot exacerbated by EGR  that nitration that is usually driven by lower temp ops than oxidation, will drive nearly clear deposits sticking rings and interrupting tribo layers of lubricant where its needed. 

 

There are no engine oils that can limit or reduce nitration effects. Once nitration is forming more fuel in oil will initially physically dilute it but the effect with every firing of piston will add nitration, shellac, varnish, eventually blow-by of oil will form coke and sludge. 

 

 

 

[diyer2]

So in layman's terms, the problem started in 1000 miles.

[customboss]

1 minute ago, diyer2 said:

So in layman's terms, the problem started in 1000 miles.

No Sir,  the problem started when the engine was pumping more  unburnt fuel into the crankcase than burning the fuel off in the combustion chamber. Regardless of reason.  When any IC engine fails to burn off its fuel and its recirculated into the sump and combustion chamber by EGR and crankcase vent function it will fail eventually from those deposits.  Sometimes causes of damage for our modern engines is complex and not easily seen because there is no early warning.