Good Dino oil for fuel dilution?
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Anyway so the consensus is, no conventional oil can handle fuel dilution well? I just wanted to get an answer thats all …
Well … no motor oil is probably going to handle fuel dilution "well". But if you are going to be doing relatively shorter oil changes (3-5K miles) I wouldn't rule out conventional oils -- even in a turbo equipped engine. The thermal/oxidative stability of GII's is far above what the old conventional GI's were years ago, so I don't have great concerns here about modern conventionals not being able to handle the heat in a turbocharger equipped engine at reasonable OCI's.
In the article (at Chevron's site) The Evolution of Base Oil Technology, Kramer makes the following statement in the second to last paragraph … " … Turbine oils made from hydroisomerized Group II base oils and the appropriate additives have demonstrated significantly longer TOST lives than turbine oils made with Group I base oils. In fact, they commonly outperform the traditional “synthetics” made with PAO. …"
Agip even advertises their Group II's as performing like synthetics …
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Agip uses Group II base oils for its non-synthetic. … … Agip’s non-synthetics offer performance equivalent to most synthetics on the market.
Most conventional SM rated oils don't get a premium add-pac (or probably as good add-pac as synthetics) so they're not really formulated for very long drains. They're more of a low cost solution to meeting the latest SM specification -- and they're not as shear stable as synthetics. Likely the best conventional Group II motor oils are to be found among the HDEOs. I would consider a 10w30 HDEO with perhaps 1 quart of 15w40 mixed in to raise the HTHS and viscosity a little. Or, even a straight 15w40 HDEO which would give up a little fuel economy compared to a 10W30, but would provide more viscosity protection if you think fuel dilution will really be an issue. If you are going to be doing shorter 3-5k mile oil changes, I don't see synthetics as offering much advantage to these options -- particularly the 15w40.
Anyway so the consensus is, no conventional oil can handle fuel dilution well? I just wanted to get an answer thats all …
Well … no motor oil is probably going to handle fuel dilution "well". But if you are going to be doing relatively shorter oil changes (3-5K miles) I wouldn't rule out conventional oils -- even in a turbo equipped engine. The thermal/oxidative stability of GII's is far above what the old conventional GI's were years ago, so I don't have great concerns here about modern conventionals not being able to handle the heat in a turbocharger equipped engine at reasonable OCI's.
In the article (at Chevron's site) The Evolution of Base Oil Technology, Kramer makes the following statement in the second to last paragraph … " … Turbine oils made from hydroisomerized Group II base oils and the appropriate additives have demonstrated significantly longer TOST lives than turbine oils made with Group I base oils. In fact, they commonly outperform the traditional “synthetics” made with PAO. …"
Agip even advertises their Group II's as performing like synthetics …
Quote:
…
Agip uses Group II base oils for its non-synthetic. … … Agip’s non-synthetics offer performance equivalent to most synthetics on the market.
Most conventional SM rated oils don't get a premium add-pac (or probably as good add-pac as synthetics) so they're not really formulated for very long drains. They're more of a low cost solution to meeting the latest SM specification -- and they're not as shear stable as synthetics. Likely the best conventional Group II motor oils are to be found among the HDEOs. I would consider a 10w30 HDEO with perhaps 1 quart of 15w40 mixed in to raise the HTHS and viscosity a little. Or, even a straight 15w40 HDEO which would give up a little fuel economy compared to a 10W30, but would provide more viscosity protection if you think fuel dilution will really be an issue. If you are going to be doing shorter 3-5k mile oil changes, I don't see synthetics as offering much advantage to these options -- particularly the 15w40.
A high viscosity index conventional oil would work for short duration changes, if you keep the OCI down to 3K miles, or below. I'd have used oil analysis done to see if you're breaking the oil down and sooting up.
Im wondering why anyone has not mentioned the obvious. Motorcraft 5w30? It's what the mazda dealer would use 
Originally Posted By: hominid7
Im wondering why anyone has not mentioned the obvious. Motorcraft 5w30? It's what the mazda dealer would use
Im wondering why anyone has not mentioned the obvious. Motorcraft 5w30? It's what the mazda dealer would use
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