I know the threads about which oil you use have been beaten like a dead horse, but what about us guys with 100k plus?
i run 10w-40 winter, 10w-30 summer.
Just looking to see whats popular?
So everybody who has 100k plus miles please post up.

 

30w50 tranny fluid here. runs awesome!!

 

trying to get to real info here.

 

10w30 all year around has 112k on it now got it at 90k previous owner ran same oil.

 

10w-30 castrol syntec. My question is why do you run 40weight in the winter and 30 in the summer? I ran my 10-30 from 117k to 135k

 

i was told to by this old time racer. Ive been doing to so for the past year and a half. So far the bottom end has been bulletproof. get good start up pressure and wot pressures after its warm. You think i shouldnt?

 

I dont think id change oil types but thats just my opinion.

 

I used to do something like that but it was the other way around. You'd want to run a thinner viscosity in the winter because cold weather tends to keep your oil a little thicker. Summer, if you want to thicken it up because of stop and go traffic in 100 degree weather go ahead. It sounds like it's still a good idea.

 

130000+miles 10w-30 royal purple

 

184,XXX + here, 10W-30 4 Quarts Pennzoil, 1 Quart High Mileage Additive. works wonders on my car. go to your local autozone/ advance auto parts/ checker/ NAPA for the additive.

 

To answer your question, there is probably no reason to change oil type just because you've clocked over 100,000. There may be some advantage to going to one of the oils, blended for high mileage cars. It is a good idea if you have notice a slight decrease in oil pressure over the years. In this case going from a 10W30 to a 10W40 may help, and certainly is not going to hurt.
Changing your oil seasonally is also probably not necessary. But again won't hurt.
However you are susposed to go from a 10W30 to a 5W30. Or from a 10W40 to a 5W40, summer to winter. Changing the high end, 30W or 40W has NO effect on the engine during start up. The idea being to have a lower viscosity oil, in the winter, during start up.

 

10w-30 mobile 1 high mileage synthetic

 

~160k, 10-40 Royal Purple + K&N oil filter - 10 months of summer here.

 

That old time racer must have not been too good with cars...

 

of maybe i just had it backwards. My car likes the 10-40 though.
The old timer is a good guy he wouldnt steer anyone wrong.