Hot Shot's SecretBlue Diamond Full Synthetic PAO 15W40 Diesel Oil 1 Gallon

200k on my truck and I drive with confidence knowing this is in my engine. Frequently pulling trailers, the oil looks good and smells less oxidized after oil change as well

Okay this the real deal. Recommend for all ICE applications.

Excellent product previously used rotella t6 full synthetic with Hot shots oil additive stiction. My LLY Duramax runs a lot better with way better throttle response gained 4MPG worth the extra money

My 2021 Duramax L5P still have the typewriter ticking noise with this oil. However i feel my engine is running smoother and gained 1-2 MPG. I will continue to use this oil since i don’t care about the typewriter ticking noise it will go away once oil life reaches 90% or less. Overall is a good oil.

I've tried several high quality pure synthetic Diesel oils in my 2018 F350, this is by far the best I have used and will continue to use. Better MPG, quieter engine, and engine runs so much smoother with this oil.

6.0 powerstroke

Its slippery

I have a ram 5500 with the 6.7 Cummins that I use for hot shot. I tow a 40ft trailer that is constantly loaded.Prior to using this oil, I have always used full synthetic rotella 15w40, which has been great. I only tried this oil because of the great experiences I’ve had with other Hotshot’s secret products. Honestly was not expecting much of a difference.Well, I was wrong. Upon startup after just changing the oil I noticed a difference in sound. The turbo sound was definitely more noticeable. So I let it idle and check to make sure that there isn’t any leaks, then take it for a test drive (without trailer). The truck has over 260,000 hard miles on it, but it doesn’t feel that way anymore. The sound is much better, there is less lag when accelerating, fuel economy has increased by about .3, all temperatures are down. I have had this oil for some time now and I love it. I know it’s a bit expensive, but you are getting a quality product that will surprise you.