Castrol GTX Diesel 15W-40

I believe the diesel trucks in the fleet for the company I work for all use castrol.

Is there some reason why we shouldnt be using it? I know its a lower-grade oil, but apparently it was better than most of the 'bought in bulk' oils.

superk wrote:
I believe the diesel trucks in the fleet for the company I work for all use castrol.

Is there some reason why we shouldnt be using it? I know its a lower-grade oil, but apparently it was better than most of the 'bought in bulk' oils.

No reason for not using it. Seems most are using Shell.

I think shell is used primarily because its been tried, tested, and true. You are trusting a machine worth more than most people make in 4 entire years to the maintenance you put into it.

For the $5 its going to save you, is it worth the stress?

We use it because our trucks are replaced regularly, maintained vigorously, and when speaking in terms of oil consumption of a fleet over the course of a year, these factors justify it for cost savings.

If it was my coach, I would be running synthetic mobil-1.

Most Castrol oils are HIGH quality. They meet the tougher European standards. The question about "luck" with oils makes no sense. NO RV'r drives enough miles to determine that an oil is good or bad. You would need many millions of miles to come to a conclusion. When was the last time you heard of an RV'r that had engine problems due to an inferior oil?

Moisheh

As I was taught, diesel engines are dirty engines and require a higher amount of detergent in the oil. The only real problem I ever heard of was when a really dirty gas engine was fed diesel oil it broke free the dirt and started to clog oil passages.

That was back in the day, and may no-longer hold true for todays engines/oil.

Have used Castrol for years with excellent results. As long as a oil meets or exceeds the API rating for the engine it should work fine. Oils with higher detergents will help keep the engines internals cleaner longer. Full synthetics will be of benefit in cold start situations.

Just use the tried and proven Chevron Delo 400, my brothers Peterbilt has over 3 million miles running it. You can get it anywhere Costco, Walmart, and every truck stop in the USA.

It seems on the East Coast Shell is very popular. On the West Coast Chevron Dello is the preferred. I have been around Cat and other heavy equipment for most my life and Dello was the oil to use.
In the motorhome I use Delvac. That is because that is what Freightliner shop uses. In my personal cars I used Castrol for years, it seamed to keep the engine internal parts cleaner.
As long as you use an oil that meets your vehicle specs you will be fine.

I have never seen an engine fail when using the speced oil. I have heard of kickbacks to auto manufactures for promoting a certain oil or other products.

Now for my personal cars I use whatever brandname that is on sell.

If it meets the mil-specs of your engine, you can certainly use it.

BUT, one of my criteria for choosing oils is that I can find it as Walmart, auto parts houses, truck stops, etc anywhere I go.

So, that means Shell Rotella T and Delo 400

I use Motorcraft 15-40 Diesel in a Cat C7, change once a year.