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Jim Grant's Tech Tips
Dodge
Truck, Synthetic Oil Use
Q: We just picked up our Dodge B2500 4X4
5.9 Liter Diesel a few days ago and I am trying to decide whether to switch
to synthetic oil or not. I am a believer that it is vastly superior to
conventional oil. A diesel is a dirtier engine than a gasoline one. How
do synthetic oils perform for diesels? What weight would I use for the
diesel? We plan on traveling upon retirement, pulling a 5th wheel or a
trailer. We hope to keep this truck forever! I would appreciate your answer....Doug
& Suzie
A: This
may surprise you but synthetic oil is listed as an approved lubricant
for the engine of your vehicle. Check your Owner’s Manual, I believe the
oil has to have a minimum API Service Grade rating of CF-4 or CG-4. You
can find the API Grade Rating listed on the oil container. I agree that
synthetic is a better grade of lubricant to use in your engine. But! Don’t
think for one moment that you can run the oil any longer or beyond the
manufacturer’s recommended service intervals. Many synthetic oil producers
will state that their oil can be run for extended mileage, over and above
vehicle manufacturer’s service recommendation. I have yet to see any of
these companies put in writing that, if a problem arises with the engine,
they will step up and fully warranty the vehicle’s engine. Synthetic is
great-go ahead and use it, but always follow the manufacturer’s recommended
service intervals while the vehicle is under warranty. After the warranty
is up, you do as you please.
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