Oil, yes rain me down with your thoughts
04-19-2018, 10:25 AM
#26
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It's not the weight of brand new oil that matters.
It's the weight of the oil just before you change it.
If the oil is a 20w50 when you buy it, but has degraded to a 0w5 by 1,000 miles, and you change it at 3,000, it isn't doing anything for you. The Renesis breaks down oil viscosity FAST. It heat cycles faster that piston engines, with greater extremes, and rather than only a small fraction of the oil seeing the high pressure bearings in a piston engine, a relatively higher percentage of our oil passes through the bearings. So we have relatively higher highs, lower lows, shorter cycle frequency, and higher pressure than a gasoline engine. It beats the f*** out of the oil viscosity.
UOAs posted over the decade+ have showed that by 2,000-2,500 miles, most oils have lost appreciable viscosity. A few hold up longer. Mobil 1 0w40 holds up if you go for 3,000 mile changes, i forget the couple rare others.
But handily, there is a type of engine oil that is designed for high stress environments that holds up well that is cheaper. "Diesel engine" oil. It supposedly has some elements in it that damage cats faster, and since our oil definitely goes through our cats, it's recommended to be catless if you use diesel oil, but if you do, they hold up rather well. I do Shell Rotella. The viscosity holds.
It's the weight of the oil just before you change it.
If the oil is a 20w50 when you buy it, but has degraded to a 0w5 by 1,000 miles, and you change it at 3,000, it isn't doing anything for you. The Renesis breaks down oil viscosity FAST. It heat cycles faster that piston engines, with greater extremes, and rather than only a small fraction of the oil seeing the high pressure bearings in a piston engine, a relatively higher percentage of our oil passes through the bearings. So we have relatively higher highs, lower lows, shorter cycle frequency, and higher pressure than a gasoline engine. It beats the f*** out of the oil viscosity.
UOAs posted over the decade+ have showed that by 2,000-2,500 miles, most oils have lost appreciable viscosity. A few hold up longer. Mobil 1 0w40 holds up if you go for 3,000 mile changes, i forget the couple rare others.
But handily, there is a type of engine oil that is designed for high stress environments that holds up well that is cheaper. "Diesel engine" oil. It supposedly has some elements in it that damage cats faster, and since our oil definitely goes through our cats, it's recommended to be catless if you use diesel oil, but if you do, they hold up rather well. I do Shell Rotella. The viscosity holds.
04-19-2018, 11:17 AM
#27
^^
So based on that and 4 years of UOAs, I feel pretty good now about recommending LiquiMoly synthetic.
It consistently comes back with cSt viscosity at 100C corresponding to 30 to 40 weight (starting with a 10W/40) after 7,000km (4500mi) oil changes.
https://www.rx8club.com/series-i-tec...6/#post4801917
The W stands for whale.
So based on that and 4 years of UOAs, I feel pretty good now about recommending LiquiMoly synthetic.
It consistently comes back with cSt viscosity at 100C corresponding to 30 to 40 weight (starting with a 10W/40) after 7,000km (4500mi) oil changes.
https://www.rx8club.com/series-i-tec...6/#post4801917
The W stands for whale.
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