Which oil is better for an 6.5L DIESEL egine that REQUIRES 15W-40 Oil. I am having a hard time deciding between Amsoil Synthetic Heavy-Duty Diesel Oil and Mobil Delvac 1300 Super. I can't figure out if the Mobil Delvac is synthetic or not. I'm not even sure if synthetic is the best way to go in diesel engines. Any advice would be greatly appreciated.
2007-01-27 15:41:24 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Mobile does make a diesel synthetic - Delvac One. It would be 5w40 weight and would be an excellent oil. You will probably only find it at truckstops. The main reason to go with synthetic is for cold weather starting and operation. Don't be afraid of the 5w40 designation, it fully protects at the temps a 15w40 would. Otherwise if severe cold weather is not your issue, any quality diesel oil sold today surpasses the requirements for your (older) diesel engine. Mobile Delvac, and Shell Rotella are both good choices.
One issue with a full synthetic is that if there are any oil leaks, the synthetic will find them.
Also realize that there is no consistent definition of synthetic. From my understanding, both Mobil and Amsoil's synthetics are "real" synthetics. A real synthetic will be $4-6/qt.
2007-01-27 16:58:22 · answer #1 · answered by Bryan 2 · 0⤊ 0⤋
ive owned alot of different trucks that ive run 15-40 in them as long as you keep it changed on a regular basis i think its just as good as synthetic. The cost of synthetic over regular is not much of an issue you pay more for synthetic but you can run it longer i think its all a matter of personal opinion. I myself cant get it into my head its ok to run 20000 miles on an oil change like they say synthetic is good for. Ill run the old stuff its worked good for me thru the years. Mobile 1300 as far as i know is not synthetic. If its syn. its usually clearly marked.
2007-01-27 15:59:20 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Delvac is a very good oil, I think it's a semi synth. I'd definetly go with a synthetic over regular, although it doesn't matter too much. Just go to wally world and get what's cheapest.
2007-01-27 15:50:20 · answer #3 · answered by Jake 4 · 0⤊ 0⤋
I would go with the amsoil.I think it is probably the best oil made and I have used it for several years.
2007-01-27 15:49:42 · answer #4 · answered by Jim C 6 · 1⤊ 0⤋