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I have been a Heavy Duty Truck Mechaic for 30 Plus years.

I use Dello 400 15/40 Diesel Engine oil exclusivly and have been using it for most of the 30 years. I only have Gas Engines but still only use the Dello 400.

18 wheeler Diesel engines run approx 500,000 miles before they even think about an engine rebuild, most of the trucks log about 5,000,000 miles before they are traded in or replaced, The Dello 400 engine oil helps greatly with this feat, i believe.

You can get it a Costco by the Case, 6 each of the 1 gallon jugs, cost's $66+Change Per case, breaks down to about $2.75 per quart.

I have never lost an engine for any oil/lubrication problem since using it.

I even use in my TH-400 trans in my 81 GMC Suburban, although I use the 10weight in it, otherwise it doesn't want to shift when it is cool outside.

We used the Dello 400 in the heavy duty Allison Transmission where I used to work, and it did better and gave better service than the ATF fluid that was in them.

For a NEW or LATE Model Engines, I like the Mobil 1 oil myself. Old and Well Broken in engines are looser, and have looser Tolerances so the heavier oil is good for them.

(I don't have any of these myself, just older types of engines, and cars)

Just my .02 Cents, take it for what it's worth, or not

Hope it helps


I live in northern California, Sacramernto area, temps are moderate normaly,gets hot in summer
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