Where to use T4 15W-40 in a 10W-30 World?

[Astro_Guy]

I am retiring an old Craftsman leaf vacuum with a 4.5 HP Tecumseh that had been running on T4 15W-40. This leaves me with 2 quarts of unneeded oil. My outdoor fleet is now almost exclusively OHV powered with 10W-30 oil recommended. The exception is a 1985 vintage Troy-Bilt (real one - not MTD) with a 5 HP Briggs flathead. This puppy calls for SAE 30 but currently runs T6 5W-40. I have no intention of putting the 15W-40 in there because this machine does most of its work at around 40 degrees at the beginning and end of the gardening season. Maybe I should rethink that?

So, should I just use it as top up oil in whatever needs it, or is there a better alternative?

 

[hatt]

Put it in any one of the other engines.

 

[Dinoburner]

I accept gifts, no really use it in most any air cooled engine in warm temps.

 

[Dinoburner]

I accept gifts, no really use it in most any air cooled engine in warm temps.

 

[wpod]

The xW- 40 is a better oil for air cooled engines I run xW-40in my lawn mowers, line movers, pressure washer and generator. , In July I put in some left over 5W-30m Quaker State ultimate and the other day I changed the oi land is was more sparkly than with the xW- 40 wt. I have had the mower since 2011 and change the oil twice a year as it cuts 17,000 sq ft of lawn every 5 days. Not commercial use but quite a bit

 

[jeepman3071]

15w40 will still work fine at 40 degrees, like mentioned above it will work in all of the other machines. The only thing I wouldn't use 15w40 in would be a snowblower. Even then, it won't hurt anything just might be harder to pull over.

 

[Astro_Guy]

15w40 will still work fine at 40 degrees, like mentioned above it will work in all of the other machines. The only thing I wouldn't use 15w40 in would be a snowblower. Even then, it won't hurt anything just might be harder to pull over.

Actually I found a use for this as chainsaw bar oil when a major cutting project commenced late last summer. The next 15w-40 to land around here will be the new Rotella T6. It looks as if the summer toys will be heading into hibernation soon. I anticipate spreading around four quarts of the 15w-40 T6 sometime this month.