Offers same characteristics as 10W-30 & 15W-40 but is used in all temperature ranges from -40°F to 122°F. This is synthetic base oil which offers superior soot control, maximum sludge & varnish control as well. SAE 10W-30 Break-In . This oil is shipped in the diesel engines from the factory. It recommended to run at least 100 hours on this oil.

15W-40 and 10W-30 are two different grades of engine oil. 15W-40 has a higher viscosity level, while 10W-30 is thinner. There are various advantages and disadvantages associated with both thick and thin oils. Thicker oils offer a higher degree of protection since they form a thicker barrier between the internal moving parts.

Many medium and large fleets are ditching 15W-40 heavy duty engine oil for 10W-30. The most common reason for the change is the increase in fuel economy by switching to lower viscosity oil. Fuel economy improvements are correlated with viscosity. Engine oil’s main job is to protect your truck engine. The combustion cycle creates heat, soot
Shear Stability. One final difference between Rotella T 15W40 and Rotella T 50 is that Rotella T 50 has better shear stability. This means that it will maintain its viscosity better over time, providing better protection for your engine. Rotella T 50 is the way to go if you’re looking for the best possible protection for your engine.
I recently put Delvac Super 1300 15W-40 in my LT4 Corvette with 45,000 miles on it. Engine runs great and doesn't burn oil between changes. The dipstick level didn't change noticably in 6,000 miles on M1 5W-30. It appeared to drop less than 1/10 of the way to the add mark. The 15W-40 is in there for a rinse cycle on ARx.
Better Cold Flow: Another big advantage of Shell Rotella oils is that they are great for sub-zero temperatures. As this cold flow test shows, Shell Rotella T4 15W-40 beats Mobil Delvac 1300 Super 15W-40. Although for a very cold start 5W would be a better option, the 15W by Shell Rotella doesn’t disappoint.
The main difference is that 10W40 oil is thicker than 10W30 oil at higher temperatures. Both have almost the same characteristics – the only difference is the oil viscosity. Sadly, that quick answer probably doesn’t make it much easier to understand. You will first need to know what oil viscosity is and what the numbers of both motor oils mean.
The main difference between 5w40 and 15w40 is that the oil is much thinner at low temperatures, so it does not require a long time to reach the engine. On the other hand, 15w40 has much more viscosity. This oil can handle heat up to high-temperature conditions because it has good resistance to oxidation and thermal stability.
The Penrite HPR 15 Diesel 15W-50 is semi-synthetic and JASO MA rated, plus ACEA A3/B4/E7, API SL / CI4+. I saw Valvoline full synthetic SynPower 10W-50 on sale at SuperCheap a few weeks ago. Another full synthetic car oil, I haven't used it yet, but it was a good price and I would happily put it in my bike. .
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    • difference between 10w and 15w oil