Originally Posted By: Toptierpao
You are funny.I like you,however,that is how I feel about you running your truck which is Direct Injected and has a CR of almost 17:1, for 10 plus hours per day with EGT's at 1200-1300 degrees on conventional 30W oil. The combustion chambers hellacious heat,piston tops,ring lands,and side skirts had a field day eating away at your oil.On top of that,you are not changing the oil which has over 11.5k miles of hard use and are thinking about going an additional year? A dangerous game that will bite you in the tail over time imo to prove that a 10W30 is good enough.
The reason diesels have always been specked for a xxW40 is to help keep viscosity with expected dilution. We do not even know the real dilution number with your uoa. Would not be surprised if oil viscosity was in the 20's and God knows what it was going thru the turbo at those temps for the duration you mentioned.
Elsewhere,you state that you do not fall under severe service conditions.What do you consider to be severe service? Flames shooting from under your fenders?...
In reference to the block heater,I said it was over kill,but,why should I change? It certainly hurts nothing and I never had batteries last 9 years.
Air filters.....On our cars,I was changing them every 15-20k miles or every 1-2 years.Diesel trucks,I drive them 10k miles or less per year,so,I change them yearly. A dirty filter on anything with a turbo makes for an inefficient engine and the turbo will spin faster than it has to which will,in time,shorten life. Needless to say,a faster spinning turbo puts even more stress on the oil.
Yeah, all my "hellacious" adventures have ended up with perfectly normal wear rates, despite your ongoing, never-ending dooms-day predictions.
Diesels have been spec'd for a lot of different lubes; certainly 15w-40 being predominant for a long time. But that was due to a few things like VII degradation (shearing) and lesser control over manufacturing clearances, etc, so a "thick' lube was preferred. It was NOT because of dilution; that's a fairly new concern due to regens for DPF function. 15w-40 was never spec'd due to regens; the use of 15w-40 predated dilution concerns by a few decades. Your facts are grossly flawed. Also, today, 10w-30 is spec'd in a lot of OEM applications such as from CAT, Volvo, etc in the most demanding of OTR and off-road applications.
The "severe service" I was referring to was in regard to the Allison trans, and how THEY define severe service. You don't read closely enough. No flames coming out from under my hood, thanks.
Apparently you didn't read the article by Jim Allen about air filters. There is clear evidence that overly frequent air filter changes have the propensity to induce greater intake of contamination. But then again, I don't think you ever read the UOA normalcy article either. So I'm not surprised.
It's your truck. Have at it. Do what yo want; no one is stopping you. Just don't try to convince us that your plan is the only one worthy of use, and that they rest of us are killing our investments, just because we don't subscribe to the "always the most expensive, all the time, as frequently as possible" routine. You stick to your mythology and rhetoric. I'll stick to facts and data from real world applications.