When do you do Rods and Mains? How about inframe?

i had a complete inframe overhaul on my 3406b cat back in 1998..Cost me $7,000 (That was HIGH I thought back then)

To this day.....I put 900k back on it..still sounds good ample pressures

I change my oil every 8-10k.....NEVER go over that. No,Its not over-servicing either.. made me LOTSA LOTSA $$$ moola over the years

 

If they did it in 2.5 and a polish your bill would still say 4 hours I bet.....

 

I was looking at this thread because I run about 700 horse power and pull hundred thousand most days so I was kind of wondering about my rods and mains being my horse power higher but like they said I think I’ll just run it and do oil samples thank you guys !!!