I sold hundreds or maybe thousands of gallons of this oil when I worked at Mayflower Transit when it was located in Carmel, Indiana. All of the old school, 20-40 years on the road, and new truckers used this oil on their rigs and most changed their oil at 10K miles but some would go 20K -40K miles on one ten gallon Rotella 15W40 oil change.
Some guys in the service shop used the same Rotella 15W40 on their pick-up trucks, year round. Good all around oil for all heavy duty applications.
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I autocross the car a lot and it's getting warmer out now here in MA. My question is - do you think I should switch to Shell Rotella 15W40 for the summer months? I only question this decision because I'm going from synthetic back to conventional. I think 15W40 is too thick for the winter months here though, since it can get reasonably cold.
JR Good point. So what's the spec for Rotella T 15w40? CJ-4/SM You can find the API specs pretty easy on the internet. Sure enough SN spec says maximum of 800ppm for Phosphorus. That's not good and a lot of folks talk about this...but there's a footnote on the limit.