For a 2005 Trail Blazer with 4.2L I-6 :
* When to change oil - 0% or do you change at a higher % (i.e. 10% , 15% , 20% )?
* With synthetic oil - would you feel more comfortable to run the GM OLM down to 0% or even re-set and run down to 50% to 75% ?
I would have to believe an '05 Trail Blazer OLM was developed around conventional oil thus you could run synthetic oil longer ?
GM just states "with synthetic oil simply follow the OLM for a cleaner engine" ... Your thoughts , experiences and preferances for above ?
* When to change oil - 0% or do you change at a higher % (i.e. 10% , 15% , 20% )?
* With synthetic oil - would you feel more comfortable to run the GM OLM down to 0% or even re-set and run down to 50% to 75% ?
I would have to believe an '05 Trail Blazer OLM was developed around conventional oil thus you could run synthetic oil longer ?
GM just states "with synthetic oil simply follow the OLM for a cleaner engine" ... Your thoughts , experiences and preferances for above ?