It is a low-mileage engine, under 50K miles.
It uses about 1qt per 800 miles. Basically drinks it.

The last time I used Castrol GTX 10/30.
Before the winter, I plan to use Chevron Delo 15/45 and 1qt of Mobil 1, probably 10/30 weight.

Any suggestions aside from using a straight 40 weight in the summer?

 

Why not Penzoil or Quaker State High Mileage 10w40? I think these would have a higher viscosity than the Delo/Mobil 1 brew.

 

I'd just use the Delo 15w40 and not worry about mixing it with the M1.

 

Why not fix what is wrong with it before you worry about what oil to use. You didn't say how old the engine was. First, I'd run a DRY the a WET compression test to check the rings. If that shows no problems and the ol pressure is good, I'd replace the valve stem seals. This can be done w/o removing the heads. I mentioned oil pressure because excessive loss of oil past the bearings can flood the cylinder walls to the point that even good rings can't control the oil and it will get into the combustion chamber. Good luck.

 

I would not mix the oil .

I would though treat it like a keeper since it has low miles and mucho life yet and run a proper grade oil for the season and keep it topped off .

Straight 40wt ? The oil makers recommend no lower than 60F ambient for that stuff

 

This should go without saying, but, have you checked for leaks?

 

I'm sure you have replaced it but how old is your PCV valve? Could it be stuck?

 

No leaks. I will re-check PCV valve.

I keep hearing stories of 460s burning oil from day one... Would be interesting to see what delo 400 does (15/40 weight)

 

I had an 86 company truck with a 460 that didn't use any oil, had a lot of miles on it.

 

I Use Delo 15/40..145k On The 460 And Uses No Oil And Does Not Leak.

 

Ditto on finding the problem first. If it is a money issue, use straight 30 weight. If you plan on using it in cold climate (under 20 F) use a multi grade.

 

I have a 95 F250 w. 50K miles. 460 5spd. Use 10W-30 Castrol. Uses no oil whatsoever.

 

My dad has a 1988 F Super-Duty at work that has a 460 in it. It uses 1-2 quarts of oil PER DAY! We only drive about 50 kilometres MAX. I think ours drinks it more than yours does. We call the truck "Smokey!"

-Matt

 

I had some lady talking to me at work..and her and her husband had to keep a DRUM of oil in the back of her chevy. It went through roughly a gallon an hour, AN HOUR. If they tried to drive anywhere more then a few minutes around, he'd have to periodically get out and transfer oil back in the engine. Sounds a bit excessive, but she was adamant. It'd be cheaper to rebuild an engine that bad! You'd HAVE to use Supertech oil with that thing lolol.

 

Heck, run a dry sump and cycle it through the drum. Never have to change it that way!