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Ya it's a pain we have to custom order the Delo 10w30

Our new Paccar mx13 engines came factory filled with Delo 10w30. Cold starts plugged in -10f to 100deg. Doing oil changes at 300hrs would like to run a synthetic & change at 400hrs. At 300hrs it's approx 8000 miles. Any oils you would recommend for this engine don't mind spending more $ for a...

Ok next? How bad is it to switch from one oil to another after an engine has 200K on it?? In switching to a full synthetic or a 5-40 am I going to run into leaking seals or issues with parts?? Been told in the past it was bad to do but is that an urban myth?? Granted all motors we have are...

We let them warm up to warm oil temps before we roll. Block heaters warm the water not the oil

Hoping someone will be able to help us out with our fleet of trucks. Here is my problem I run 2 C15 engines 6 ISX 15L Cummins motors & 2 new Paccar MX 13. All these motors haul gravel big loads 105 500 lbs. Change oil & filter on religious 300 hr basis less than 10k miles with Cat & fleet guard...