Originally Posted by SAJEFFC
Good morning BITOG! Long time member here but haven't posted in awhile. Looking for some input on oil for a new 6.7 F350 dually. I tow a 42ft 16500 pound fifth wheel with it. Mostly tow around Texas so no big hills. The truck is a tow vehicle only so no daily stop n go driving. It's a year old with 4500 miles. I want to stick with Motorcraft oil for personal reasons. I have used the MC 5W40 synthetic for the last year but switched to the MC 15W40 on the last change. The OLM drops like a rock with all the sitting that the truck does so I hated the $ 200 synthetic changes with minimal mileage on the oil. Will I be ok with the 15W40 dino oil? I'm sure I will but just looking for others experience with 15W40 and heavy towing in the heat. Thank you.
I'm a long haul Owner Operator truck driver, so my application is quite different than yours, but I think 15W40 conventional HDEO will do a very job for you. Motorcraft is a Conoco Phillips oil, and IMO they produce excellent lubricants.
I'm familiar with their products. I'm currently running 15W40 Phillips 66 Fleet Supreme EC in my motor, which I assume is very similar to the Motorcraft 15W40, and it's done a really good job inside my motor.
I typically run Phillips 66 Guardol ECT semi-synthetic, but I didn't make it home to stock up. I found a Distributor on the road, who only had Fleet Supreme EC 15W40 on hand, so I decided to give it a try. I haven't ran a UOA on it yet, but I've had zero consumption, and my oil pressure, and oil temperature readings are unchanged from the Guardol ECT.
I've compared UOAs on Guardol ECT to UOAs when I used Mobil Delvac Super 15W40 and Delvac Elite 10W30 CJ4, and Chevron Delo 400 LE 15W40 CJ4, and Chevron Delo 400 SDE 15W40 CK4, and Delo XLE 10W30 CJ4 and CK4, and Phillips 66 Guardol ECT gave me slightly better wear numbers than Delo and Delvac.
Not to say the numbers the Delvac or Delo were bad in any way, in fact both did a great job. But the Guardol showed a smidge better numbers, and my local Phillips 66 Distributor, and a Distributor that I buy from when I'm going through Idaho both regularly beat Walmart's prices on Delo products.
In my opinion, Conoco Phillips HDEOs are a real sleeper.