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What was the recommended oil for those engines when they were being manufactured 20 + years ago? Anyone know?
Since it was an old MB diesel engine, probably 15W-40 or 20W-50(60).
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What was the recommended oil for those engines when they were being manufactured 20 + years ago? Anyone know?
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What was the recommended oil for those engines when they were being manufactured 20 + years ago? Anyone know?
Since it was an old MB diesel engine, probably 15W-40 or 20W-50(60).
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I'd be very hesitant to extrapolate this to overall wear rates using modern oils in modern gasoline engines.
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Wow!
Who would have thought that an SAE 30 might outperform a multi-grade oil, at least under a very specific set of conditions.
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LOL This reminds me of that "dirty oil lubricates better than clean oil" (or whatever) thread...![]()
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There are some gen sets in Alaska that are used in emergency communications and they are careful to keep the oil warm all the time so they can use straigh 30 weight oil. The maintenance people claim it's worth the trouble keeping them warm. These engines do nothing most of the time but when called upon are ramped up to 3600rpm in 60 seconds and come to full load in 180 seconds to take over from the battery system. They only run at 3600rpm usually fully loaded. They are either feeding the grid or charging the batteries, then shut down. These engines live on Delo 400 30W and there is nothing you can do to get these guys to use a multi-grade oil.
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When discussing the "cold" performance on the original graph on page 1, we need to keep in mind that the temperature scale is in celcius. Therefore the "cold" data in the graph is essentially room temperature.
plane engines operate at a some what steady engine speed and most? are air cooled, straight weights are used as not to have ring sticking from the viscosity improvers ,like the recommendation for some marine engines.Quote:
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G-MAN do you have any other tests of 30 weight?
I'm still researching. There seems to be a camp in the piston engine aviation community that prefers straight weight oils over multi-grades because of lower wear.
Buster viscosity index has no real meaning other than how the oil resists thinning when heated . An oil with lots of viscosity improvers will have a higher vi but under stress the oil "film" will be way less to to the shear. Look at the VI of a straight weight oil.Quote:
I would say RL uses little/no VII's in most of their oils. RL 5w-20 has a VI of 145 vs Amsoil 0w-20 of 165. Performance is a different issue.