I saw that T6 was now available in 15w40 now. I need to figure out if I am going to stick with T6 or go to Triax, LE8700 or Travellers.

I have run out of my 5w40 T6 stockpile and have 4500 miles to figure it out...

 

Be interested in the price of that vs others as well

 

Any reviews on this new T6 15-40? Cost? It says better flow capabilities in cold weather? I have been running LE 8700 with no complaints but availability sucks and shipping is killing me. Looking for a suitable replacement?

 

Finally, a good option for winter vs summer oil, while maintaining the same additive package, competitive pricing, and broad availability of the T6 full synthetic product.

Like Sous, I have a stockpile of T6 5W-40 (but enough for the next 45,000 miles).

This new T6 15W-40 option means that I can save the 5W-40 for use in the winter months, and run the more appropriate 15W-40 during the summer months, reducing oil consumption during the summer from the burn off of the lighter oil.

 

Haven’t seen it locally yet. I changed mine a couple days ago and used the 5W40 since it was on sale for $23.99/gallon and didn’t feel like paying $35 for Schaefer 9000. Ran that Schaefer for 18,000 miles though so will be curious what the UOA looks like when they get it back to me. Won’t leave the T6 in that long.

 

Does the Schaefer last 18K based on the UOA?

 

How do you figure 15w40 is more summer appropriate? They both have the same viscosity at 100c right at 14.7cst.

 

No no for 15w-40 in REAL winter use,5w-40 or even 0w-40 for cold months.10w-40 would be the all around choice..

 

We'll see. They recommended 16k last time so I went over a little. I was running heavy highway miles out to Indiana and back to Washington and also using the big blue Donaldson filter which I believe does filter a little better than the regular 1995 Motorcraft does and holds about an extra 1-1.5 quarts. Not uncommon for OTR tractors to run 20-25k OCI's just fine with the right product. I would stick to 10k under more normal pickup truck usage where there is a lot more cold starting and in-town stop and go driving using synthetic oil. Maybe 5-6k using the cheap stuff. I'll post the Blackstone results when I get them back in a couple weeks. Haven't even mailed it yet.

 

They also offer T6 in 0W40. Have seen that on the shelf before at Autozone in New Jersey. It is primarily sold in Canada I think.

 

What number? THIS one?

 

Not sure how much the difference is between 5W40 and 0W40 but I'll give it a whack

 

Experience.

With 5W-40, about 2 quarts of oil disappear between 3K interval oil changes during the summer months in climate equivalent to yours.

With 15W-40, no oil loss is noted.

Despite the oil loss with 5W-40 T6 synthetic, I have continued to run it year round, because the more fluid cold flow properties eliminate cold start romps.

I have yet to return to 15W-40 in summer months, because of lack availability (not in the production of, but in the low cost acquisition of) a full synthetic in this viscosity. Now that T6 is offered in 15W-40, it appears possible that a reasonably priced full synthetic option might soom become, or already is, readily available through multiple retail channels were price competition is fierce. Combined with Shell's periodic rebates offering substantive discounts on purchases, I will probably try some, in the hopes of reducing oil consumption loss during the summer, while also hoping that the full synthetic base stock of the oil might contribute to finer flow when cold to prevent cold start romps with the HEUI system.

It appears that I'm not alone in believing that 15W-40 is a high ambient (summer appropriate) average temperature oil, while 5W-40 is a low ambient (winter appropriate) average temperature oil.









Clearly both multi weight viscosity grades have much overlap in average operating conditions, and the biases that favor one over the other are only found at the extremes of ambient temperatures. But the trend of which oil is appropriate for which extreme is also quite clear.

 

https://www.riffraffdiesel.com/donal...-filter-94-03/