Is it ok to run 10w30 high mileage oil

[chinesebob]

I changed my oil with the Castrol GTX High Mileage 10w30 oil, when I was
at the store I thought it said diesel on it but, now, after it's already in the
engine, I cannot find the word diesel anywhere on the bottle.
It doesn't specify gasoline on the bottle either. It's this stuff
Castrol USA - Castrol GTX High Mileage

So, I do want to change it but, is this something that can wait a bit, or is it
a "do it now or die" sort of thing?

My truck is a '91 F250 7.3L IDI 4x4

Thanks for any suggestions

[RWF350]

I don't see the diesel ratings. SF,SG,SJ etc are gasoline ratings. Diesel rating start with C's, like CE, CI, etc.

[rfishoutofwater]

I would change it. 15-40 is whats supposed to be in it. 10-30 is for gasers.

[LMJD]

You want Castrol Super RX 15-40.

[chinesebob]

I'll try to find the Super RX.
My big question right now, is, that I need to drive 60 miles and don't have
time to change the oil between then and now, do you guys think I'll mess
up my engine running it a few hundred miles on the 10w30 high mileage oil?

Thanks again

[NH2112]

No, you won't mess up the engine, but I'd replace it as soon as you get the chance.

I'm a big believer in Rotella-T, Delo 400, or Ursa.

[LMJD]

You won't hurt anything. If you do want to go the Castrol route, I've always bought their diesel rated oil from an oil distributor by the case.