I've used this oil in the past but the label on the front doesn't say synthetic or synthetic blend you can't tell what you're buying especially for a first time buyer. It's only in the fine print on the back.

we change are oil 2 to 3 times a month, every 5000 miles, this is the only oil we use. We love it! Little hard to find, when we do we buy a lot of it to keep on hand! Thanks for keeping out trucks up and running!

I have used Mobil Delvac in all my vehicles and tractors for 55 years. Never any problems and my current vehicle has 280,000 miles on it. This is the best product on the market!

My 08 Silverado currently has 1,176,894 miles on it. It's never had any internal problems or repairs. It's only had Mobil Delvac 1300 Super oil since it was new. I'd highly recommend this oil & plan on using it in the future.

This is the only oil I use in my truck, I have 381,000 miles on it and No oil consumption between oil changes. I would never use anything but Mobile Delvac, excellent oil for your diesel.

Use mobil oil in my tractor and lawn equipment for the last 20 years and have good luck with their products.

I have been using this oil since 2014. I use it in my pickup, heavy equipment, tractors. I have never had an oil related problem.

The only oil I used in my 2001 Ram Cummins. Had 250K on it when I sold it and it was still going strong!

I’ve been using this oil in the same engine for over 200,000 miles don’t use any oil between oil change

Great product use it in semi's all have over 500k and no oil consumption. Change every 400 hours or 15k miles