Originally Posted by slipstream444
Well, I researched RLI's products - and while I like the idea behind their product line and I am a huge supporter of the development of alternatively sourced hydrocarbon-based products (as long as my tax dollars don't subsidize their production and marketing) - their 5W40 weight oils have an HTHS only fractionally higher than the 5W30 I'm currently using.- and their products are more expensive than the Redline oils that I have been considering - so therefore I'll be switching to Redline 0W40 initially when I return from this deployment in November (beginning of the cool down along the Northern Gulf Coast), and then on to 5W40 in March of ‘19, when things warm up.
RLI 15w40 HTHS > 3.7 cP (minimum HTHS for a 15w40)
RLI 5w40 HTHS > 3.7 cP (minimum HTHS for a 5w40)
RLI does not publish all the HTHS values for ALL their products. However, due to the unique properties of their oils, high density and VI, the actual HTHS values are higher than typical synthetics for the same viscosity.
For example, their 10w30 HD oil has an advertised KV @ 100c of 11.0 cSt. The HTHS is 3.6 cP.
I saw a comprehensive independent oil analysis of the RLI 15w40, including HTHS. I believe it was measured at 5.2 cP @ 15.5 cSt.
With the 2 examples above, I would estimate the RLI 5w40 to have an actual HTHS of 4.5 or 4.6 cP @ 14.0 cSt.
My own experience using RLI currently, is a 10w40 50/50 blend of 10w30 HD and 15w40 which KV @ 100c was measured at 13.3 cSt per Oil Analyzers. However, using this blend my oil pressure was 5 psi higher at operating temp than the 14.5 cSt 5w40 in a previous fill.
How can a 13.3 cSt oil have a 5 PSI higher pressure than the 14.5 cSt oil? Because the HTHS value is greater with the 13.3 cSt blend. Crazy huh?
This 10w40 blend flows better than the previous fill and eliminated the cold start valvetrain tick I had using D1 5w40.
The RLI Biosyn Xtra SHP 0w30, 5w40 and 15w40 offerings have impressive specs. Nothing really compares to them. Vegetable Ester based lubricants also have unique properties than make them superior in many ways to hydrocarbon based synthetics. If you want to research them further there are scientific studies available on the internet.
Originally Posted by slipstream444
I'll run my first fill of 0W40 for about 500 miles, and then drain and fill again. The second fill I will run for about 3000 miles and then I'll start a UOA baseline. By then it will be time to switch to 5W40, which I will run for about 3000 miles, and start the baseline for that weight. After that I move to a 7500 mile drain interval to determine how well the oil holds up, and then determine if I want to move to a longer or shorter drain interval after that - or if I need to switch to another oil.
You don't need a 0w40. A synthetic 15w40 is acceptable for 0F or slightly below. You can use a 10w or 15w in your climate without any problems, and they will resist shearing better than most 0w or 5w options.