Amsoil 15 40 vs Rotella 15 40 syn. Or stick to conventional?

Any oil on the PGOS list for the longer drains is going to be fine.

Warren (The Nebraska/Iowa company not Warren Unilube) the blender of WalMart Supertech is on the PGOS list so its a good product.

My suggestion would be to a add a sample valve and pull a sample every time when doing your chassis lube ($172.00 for a dozen prepaid sample kits from Polaris who does testing for Amsoil and Shell). It will tell you things other than when the oil needs changing. Like when you have a head gasket starting to go before it damages the engine. As to longer oil changes my Cat 3406E went 1.4 million miles with 30,000 mile changes of Chevron Delo 400. The failure was not lube related but a broken crank due to a failed crank damper.

 

Out of curiosity, how would one explain burning through both Rotella & Schaeffers synthetic to virtually nothing with Mobil? I don't know what additives the previous owner had in the truck & am sure there is a reason. Just know my motor used similar amounts on the first two & did not with Mobil.

Btw, was or never had been a fan of anything Mobil was upcharging errr selling previously.

 

Even with conventional Mobil tends to reduce consumption. Not exactly sure why. It doesnt show up in the volatility test. When I had engines in the past that tended to suck oil past the rings when idled Mobile would often reduce consumption by 30% or more.

Now on my current engine I dont see any difference between Delvac and Rotella but it takes 17,000 miles to go through a gallon.

 

I stated that all oils today are good, but what engine oil a particular engine likes is similar to what brand of .22 ammo shoots best from a particular rifle. Sometimes brand X works well, while another engine likes Brand Y. Yet both brands will meet the same specification. Just the slightest variance in the additive package can cause this situation. Doesn't make any brand better or worse than another. In my case, the Allied brand 15w40 synthetic blend I use, I get a little more consumption, but I also get very low wear numbers than with several other brands I have used. It is all a balancing act.

 

In Canada, Wally Brand is supplied by Petro Canada which is a major oil company that has a good product.

In addition, I would like to add a comment a KW Service Manager said to me when I asked about using synthetic, he said, Lucien, you're old school and you change at every 10,000 miles or 250 hours. Stay with that program because the plug on your pan gets pulled a lot more often than with synthetic and someday we may just catch some crap on the magnetic plug that you wouldn't know about for a lot more miles with synthetic".

 

Some merit to that, prairie boy, but in my case, I have a Fumoto drain valve on my oil pan and no drain plug. But then, I send in an oil sample to the lab each oil change so I can see in detail what is going on inside. Not too much is going to take me by surprise. And those that go for really extended oil drains usually will send in an oil sample once or several times throughout the drain interval to catch something that even a magnetic drain plug would never show you. Nothing wrong most times with "old school" thinking, but sometimes throwing in a little modern thinking helps too. After all, a magnetic drain plug is not going to show a spike in lead or a leaking fuel injector or a leaking head gasket or oil cooler, whereas an oil sample will catch these things before they become a major issue.