Sludge buildup??

[nebraskarider]

Are these engines prone to sludge buildup? Had a local mechanic tell me to change oil at 3000 miles because he seen several with a lot of buildup in them. If that's what it takes to prevent it I have no problem with it but always kinda figured 5000 was safe on synthetic oils. He knows I do my own maintenance so it's not him trying to upsell me on a service.

 

[Jasminemaribel28]

don’t wait I have a 2017 sonic lt 1.8 engine i learned the hard way DONT wait

 

[milesvdustin]

I do 5000 between changes. Always use the dexos certified synthetic. I had my valve cover off to do the timing belt a month ago and the head was clean. Gold colored discoloration but zero sludge buildup anywhere.

 

[Ricekila]

Been doing my own oil changes longer that most of you kids have been alive --

Every 6 to 8 thousand miles --

Drain oil --

Replace filter with the cheapest I could find ( Wix ? ) --

Refill with cheapest oil & ( pay attention kiddies ) add a Qt. of Marvel Magical Mystery oil --

Idle for 15 minutes ( don't cheat ) --

Drain and watch all the crap come out --

Replace filter with the best you can buy --

Oil --- 20 W- 50 --

And before ya'll start squawk ------ I use 20W50 --- in every thing ----- never ever had any problems ---

What is this sludge you speak of ?