Schaeffer Manufacturing Co. 0700CK4-006S SynShield Durability Advantage 15W-40 Diesel Engine Oil, 1-Gallon Bottle

I only use this in my Cummins. Kinda expensive but you get what you pay for. My truck seems to run better and sounds better

She oil does a great job with oil quality and fair pricing for a high performance oriented oil. This oil helps out significantly on my street car that has a junkyard engine in it since running this oil my engine has stayed nice and quiet, and even while changing the oil at shorter increments for this particular vehicle, it is still quite affordable.

Excellent diesel oil. Spent a few hours watching videos on oil analysis for diesel oil. Schaeffers is top tier and has one of the best anti wear additive packages on the market.

I stand by the product with several cars! Once you have the car, change the oil & replace with this product - first oil change! Your engine will hum, run very smooth & crank smoothly (even in the harshest weather) Excellent value for the price and you can run an extra 1k miles before changing oil with this product.

I like it for my car. It works well. Good quality and good value.

Great oil, it is a little hard to get sometimes, but overall, really good oil for a diesel truck. At times, I have had my orders in the past that didn't show up and had to reorder." 2 different times"

Marketable price on a superior product.

I bought this for my old diesel tractor that makes a lot of engine noise. This oil made it run way quieter instantly. Only buying this from now on.