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30 Closed Cab PU · 10-09-2019, 08:29 AM

I find Werner's post #10 interesting. Have a motor that was rebuilt last winter and have been using Rotella 15w40 diesel oil. Motor runs great, but 500 mile oil changes are a deep India ink black color. Have tried 2 different rebuilt carbs, no difference.
After reading the above, get the impression the oil should be in better shape at the 500 mile mark. Do not run an oil/air filter, but now think oil should be in better shape anyway.

Am running the hotter W18 spark plugs to keep soot down on the outer part of the plugs, and to keep the black off the center when driving low/medium speeds.

Am now wondering if the motor may being running dirty due to the Rotella oil.
Think I will try a different non-diesel oil nest year, perhaps Castrol GTX 20w50.

What you think? Comments?

10-09-2019, 08:29 AM	#33
30 Closed Cab PU Senior Member Join Date: Aug 2018 Posts: 2,332	Re: ROTELLA 15W 40 Oil I find Werner's post #10 interesting. Have a motor that was rebuilt last winter and have been using Rotella 15w40 diesel oil. Motor runs great, but 500 mile oil changes are a deep India ink black color. Have tried 2 different rebuilt carbs, no difference. After reading the above, get the impression the oil should be in better shape at the 500 mile mark. Do not run an oil/air filter, but now think oil should be in better shape anyway. Am running the hotter W18 spark plugs to keep soot down on the outer part of the plugs, and to keep the black off the center when driving low/medium speeds. Am now wondering if the motor may being running dirty due to the Rotella oil. Think I will try a different non-diesel oil nest year, perhaps Castrol GTX 20w50. What you think? Comments?