10w oil

   / 10w oil #11  
its dipping into the teens and my owners manual says to use
5w-20 or 5w-30 below 0 degrees.
10w oil below 32 degrees.
and 30w above 32 degrees and not to substitute 10w-30 or 10w-40
i cant find 10w
and id like to run syn oil.
that would meet class cd oil and that i could use all winter season.
Finding an API CD service oil would likely be difficult since that specification
has not been supported since 1984, the current API Service for Diesel
engines are CI-4, CI-4 Plus and CJ-4.

For sub zero weather I would suggest you follow your manuals suggestion
and run a SAE 5W-30 CI/CJ service oil. They are out there. Shell, I know
make one as it is in my tractor now, it is what they deem a semi-synthetic.

Below freezing it suggests a 10W single grade oils which again are no longer
supported under the CI/CJ specifications so you are not going to find a single
grade 10W oil manufactured. I will explain more this later.

SAE 30W does not now or did not ever exist, I am assuming it is a typo and
you or your manual meant SAE 30 single grade oil.

Based on the information you provided. I would make the following recommendations.

All service grades should be CI or CJ.
0ーF and below: SAE 5W-30
Between 0ーF and 32ーF: SAE 10W-30
Above 32ーF: SAE 10W-30 or SAE 30

Finding a single grade SAE 30 CI or CJ will be very hard, although supported
by the specification I do not know of any one who produces that product.


Back in the early days of multi-grade engine oils the viscosity index improver
(VII), the additive that makes multi-grade oils work, was lacking in some
performance areas, mainly high shear stability. As a result, it was not
uncommon for SAE 10W and SAE 20W oils to be marketed, as they did not
contain any VII additive, they were shear stable and were still servicable for
engines at low ambient temperatures. Fast forward 30 years and we have
excellent shear stable VII on the market that will last 5, 10 and even 15K
miles between oils changes as a result the 10W and 20W markets and
support have diappeared but no one goes back and rewrites the old manuals.
 
   / 10w oil #12  
Choose one oil for year round operation. 5w-40 is good for -13F to 122F. 0w-40 is good for -22F to 104F. 15w-40 for 5F to 122F. 10w-30 for -4F to 104F 5w-30 for -13F to 86F. Are your ranges here or elsewhere? Philip.
 
   / 10w oil
  • Thread Starter
#13  
thanks for the replys got back in town went with buying the rotella 5w 40. life is good
 
   / 10w oil #14  
Going with a SAE 40 over the SAE 30 could leave your flow rates
too low and result in a lack of lubrication issue.

Good luck.
 
   / 10w oil #15  
Choose one oil for year round operation. 5w-40 is good for -13F to 122F. 0w-40 is good for -22F to 104F. 15w-40 for 5F to 122F. 10w-30 for -4F to 104F 5w-30 for -13F to 86F. Are your ranges here or elsewhere? Philip.

How did you factor engine design in to that information, just curious.
 

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