I just got my new ride, 2003 avalanche with 5.3 litre. My last truck, 2000
GMC sierra 5.3 litre had the dreaded cold knock start-up, which I presume
was piston slap as it seemd to go away in the warmer weather. Now I would
like to run synthetic oil in the new truck to try to keep this piston slap
problem at bay but heard that the engine should be broken in with mineral
based oil. I can see the reasoning behind this, to allow the rings and
bearings to properly seat themselves. Now what would all you guys suggest
for the break in period with non synthetic be and what is the changeover
procedure(is it simply a drain and replace when going from non to synthetic)
All advice will be greatlt appreciated.
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