I’m not a true believer in the pennzoil Srt 0w40. Yes it has more moly in it, but it’s not special in any other additive. I’ve mostly used it, but ran multiple delvac esp 5w40 OCI with no discernible difference. I don’t have a oil analysis to back up that claim. No lights came on, no flakes or glitter in the oil or filter when I changed it.
I wouldn’t be afraid to run delvac 15w40 if I were doing a ton of towing in the summer. The HDEO oils have been neutered in additives that they now look like the way 40w gas oils use to be.
I do not believe in long oil change intervals. I also agree they are to lower the cost of ownership and keep people from owning cars for 15-20 years.
The needle bearing issue with the lifters .... is that what people are so afraid about? Dirty oil or manufacturer defect? The needle bearings aren’t something unique to the hemi Chrysler engine, and other manufacturers don’t spec high moly to keep their bearings alive. So, leads back to argument, does the hemi have design defects with the oil splash that requires higher moly (which sticks and stays) to help?
We will never know, drive the your hemi and who cares! My last 2006 5.7 went 90k before I dropped an inertia cam, ported and polished heads, and SRT manifolds on it. I had used MS-6395 (not much moly) oil at 3-4K changes and the cam was smooth, heads were spotless, lifters we’re fine, and timing chain guides were perfect. I ran it for another 50k before I traded it in. Never used oil, and ticked since it was new.
I wish we had a shorty header option for our Ram 6.4’s. I’d like better flow and preserve the stock mid pipes and stay legal.
