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chris_spring
Senior Member
Username: chris_spring
Post Number: 292
Registered: 02-2019
| | Posted on Wednesday, June 12, 2024 - 07:40 pm: | 
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I have been mixing SAE 30 non-detergent oil with premium fuel at a ratio of 25:1 for use in my small two stroke engines.
Recently I mixed 5 gallons of fuel using an SAE 30 oil that did not say on the container that it was non-detergent.
My question is this. Is it OK to use a straight weight oil that may not necessarily be non-detergent in engines such as the Adams, the Kingfisher, the St. Lawrence etc? |
ernie
Senior Member
Username: ernie
Post Number: 2717
Registered: 01-2002
| | Posted on Thursday, June 13, 2024 - 06:30 am: |
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Chris,
I don't think it matters.
My reason for this comment is that the bearing surface area and piston surface area are huge in comparison to today's engines so that keeping the needed lubricity is not an issue on our old stuff.
As I understand from training classes in some previous century the detergent additive to the oil didn't change the oil, it was to clean and keep "dirt" in suspension so it would be removed during an oil change, or captured by the oil filter.
We did see some cases with a real dirty "Sludged" up engine that when detergent oil was put in it would loosen up sludge to the point of plugging up oil passages. Obviously this can't happen on a clean engine.
Also I just searched for "30w detergent oil" and didn't find any. Every hit was either non detergent or "conventional" oil.
And on a 2 stroke engine the oil doesn't stay around very long anyway...DUH
Here is a link to the 2 types of oil.
https://overlakeoil.com/detergent-vs-non-detergent-choose-the-right-motor-oil-fo r-you/
Hope this helps
Ernie |
chris_spring
Senior Member
Username: chris_spring
Post Number: 293
Registered: 02-2019
| | Posted on Thursday, June 13, 2024 - 10:45 am: |
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Thanks Ernie.
In my previous life as an aircraft mechanic we used a lot of detergent oils for the reason you mentioned.
Wrt the stuff I mixed, it did say it was good for high friction applications. I thought that'd be a good thing.
I was unsure if the detergent if there was any, would burn as well as we need it to, one of the reeasons we stay away from two stroke oil.
Cheers! |
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