How does that compare to the Delo XLE? I cant find the NOACK?
I don't have any experience with Delo 400 XLE 15W40, but I've used the 10W30 XLE and it did a great job. I'm not sure on the NOACK numbers, but I'm sure you could email Chevron directly and they'd give you that info. I've talked with their folks on their Lube-Tek phone number, and they were very helpful.
In my application, Pre-EPA Detroit Series 60 motor, the different variants of Delvac and Delo that I've tried performed identically in UOAs. I decided to buy the brand that was priced the lowest and was the easiest to find.
I drive long haul, and I'm usually loaded anywhere from 77,000 to 79,500 lbs GVW. I typically do my OCIs every 15,000 miles or 300 hours. I've pushed past those numbers by a little here and there, and the UOAs showed I could go even further, on both brands.
As a side note: I've been using Phillips 66 Guardol ECT 15W40 and 10W30 for close to a year and a half, roughly 175,000 miles, because I could get it for a lower price than Delo, but it's price per gallon has gone up a bit, unless I buy it in bulk. It's another solid performer.
I'll be switching back to Delvac Super 1300 15W40 and 10W30 soon. The gentleman who I'm leased on with stocks bulk 15W40 Delvac Super 1300 in his shop, and we're going to go in together on a barrel of Super 1300 10W30 for winter use. The cost per gallon of these two Delvac products are the cheapest I can find on any big name brand HDEO.
So, long story short. IMO Delo 400 and Delvac 1300 are excellent oils. Buy whichever is the easiest to find, and the lowest priced. Your engine won't notice any difference between the two, and you can rest assured whichever brand you choose will provide excellent service for your engine.