</font><font color="blue" class="small">( So what's a good basic oil I can use for the next 100 hours? I'm putting a lot of hours on the machine lately and I'm 12 hours over the interval. Don't really want to have Amsoil shipped. I'm cerain it's amazing oil, but just don't know if that is necessary for this type of equipment.
Is the ash level really that bad for a diesel designed to live forever with RPMs rarely over 2500? I don't know, just wondering....I'm going to can the Delo. )</font>
I would look for a group 3 (if you want) or step up to a 4 or group 5. I pay about 16 per gallon for Amosil 15w-40 HDD&M and $24 (I think) for there best diesel oil out there, Series 3000 5w30; which I am using right now to test.
The only other cheaper oil is like Rotella and again, I refuse to pay $12+ for a group 3 dino oil. It is a complete ripoff in my eyes.
Ash, from what I understand can fouling spark plugs, filling ring groves with deposits, valve wear, etc.
The problem is ash (metal sulfated ash ) comes from Detergent/Dispersant pkg. To get an ashless oil, it takes $$$$, and most people complain about prices now. Ash can come from Zinc, Mg, Sodium, Lead, Copper, Boron, etc. This happens when the additive phk comes in contact with acid (sulfuric). So if you have a high Noack oil and high ash levels, when the oil evaporates due to temps, you will have higher then normal ash levels. This will lead to wear.
Again, I personally like ashless oils.