Old timer at the parts counter told me I was bleeding injectors wrong

Was at the Cummins dealer in Fresno last Tuesday picking up a rack for a 6.7. Old guy behind the counter probably 70 years old looks at my part number and says I was wasting money on replacement o-rings. He told me I should be lubing them with motor oil not diesel fuel because the fuel swells the rubber unevenly. I've been doing it the diesel way for 12 years and never had issues. But he insisted his way lasted twice as long on his own fleet trucks. So which method do you guys actually trust long term for injector cup seals back in high miles?

3 comments

3 Comments

the_rose12d ago

That whole "I've done it this way for years" mindset is why my dad still sets his watch ten minutes fast lol.

lisab3212d ago

Tbh that kind of thinking just means you're coastin' instead of improvin'.

wells.evan12d ago

Wait, your dad still rocks an analog watch?