What oil weight would you use for a 3.0 with 200k+ miles with no severe leaks to speak of? I am of the mind that you should use the high mileage 10W-30 while others have told me I should be using a heavier 10W-40 oil. I live in Michigan so we do have seasonal changes and I would prefer not to always have to change the oil to accommodate the season.

 

i run 10 40 in the winter and 15-40 rotella diesel oil in the summer with a half quart of lucas oil treatment. as our engines wear oil tolerances get bigger so we need a higher viscosity to help keep the ticks down and oil pressure up. when i run straight 10-30 i hear a very faint lower end knock when idling, using a 40 weight oil makes it go away and has been gone for years using the heavier weight oil.

 

If you are up in the UP I would run 15/40 year round on that high of mileage engine

I run nothing but 20/50 year round it starts just fine in the garage in the winter although sitting outside in the wind after a 12 hour day. Is interesting but I have had no failures to start.

 

5/30 Syn blend, end of story

 

20-50 year round. 205,000 on the clock.

 

i use 5-30 mobil 5000 year round

 

wow that is way to thick. You need a thinner oil for startups thats where the majority of you engine wear comes from anyway. 5-3o and forget about it

 

I love the start of 22re on a cold morning with 20/50 GrrGrrGrrgrgrgrgrGrr

 

personally use 10W-30, live in the pac nw and I'm almmmoosst at 200k

 

yeah, that is some thick stuff. Man thats hard on an engine , dang.

 

I looked through my log book and I used to do 20/50, dang what was i thinking. I run Syn blend after running dino oil for 21 years. Will go full syn come next oil change. Prob Rotella..

 

Look me up when u get ready to go full syn. Look in my sig you can get a free catalog to check out some stuff. you can get it cheaper than the catalog prices tho

 

I will consider that offer, thanks