My local Phillips 66 Distributor will sell me bulk 15W40 and 10W30 Guardol ECT for a very low price. I used to do business with them for many years when I owned Ford diesel pickups back in the 80s and 90s.
I'll be using it in my Semi Truck with a pre-epa 12.7 liter Detroit Series 60 motor. I'm nearing 350,000 miles on the odometer, and I initially used 15W40 Mobil Delvac Super 1300, and 10W30 Mobil Elite. At around the 170,000 mile mark I switched to Chevron Delo 15W40 SDE and 10W30 XLE. My motor showed no difference between these two brands in the UOAs I've had done.
Guardol meets DDC's 93K222 approval for my engine, so no worries there.
The reason I'm asking is I've heard other Truckers advise sticking with the same brand of oil. And if changing brands is o.k.(?), are Guardol HDEOs comparable to Chevron Delo HDEOs?
Everyone's thoughts are welcomed. Thanks in advance.
I'll be using it in my Semi Truck with a pre-epa 12.7 liter Detroit Series 60 motor. I'm nearing 350,000 miles on the odometer, and I initially used 15W40 Mobil Delvac Super 1300, and 10W30 Mobil Elite. At around the 170,000 mile mark I switched to Chevron Delo 15W40 SDE and 10W30 XLE. My motor showed no difference between these two brands in the UOAs I've had done.
Guardol meets DDC's 93K222 approval for my engine, so no worries there.
The reason I'm asking is I've heard other Truckers advise sticking with the same brand of oil. And if changing brands is o.k.(?), are Guardol HDEOs comparable to Chevron Delo HDEOs?
Everyone's thoughts are welcomed. Thanks in advance.