Another reason for a "slightly" higher grade oil ?

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Nah, no 20W-60's, 70's or the like. There was the study posted a while back on HTHS and the requirement to stay above 2.6. We are all pretty confident (even us Aussies are starting to turn around on the issue) that a 30 weight will not destroy an engine (in spite of Shell XMO 15W-30 - must have been near 100 V.I being labelled as such 15 years ago). I was looking in the diesel oil analysis section at the viscoscity drop apparently associated with around 5% fuel dilution. The resultant viscoscity was within my manufacturer's range of acceptable, but most certainly would not have been if I'd started at 10cst. Is potential fuel dilution a genuine reson for picking a slightly thicker oil ? Sort of like an insurance policy for an undiagnosed injector problem ?
 
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quote:
Originally posted by Shannow: Is potential fuel dilution a genuine reson for picking a slightly thicker oil ?
If your asking if there is potential for some very poor used Hondas being available on the used car market in the future I'd have to say yes , the potential is certainly there . Take a oil starting at 7.8 cSt and unknowingly run it to 7500 with 2.5 fuel a few times might weaken the motor right at the knees [Razz]
 

Shannow

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Pretty much my point. Used oil analyisis will tell you early that there's an issue, but blind faith in oil change intervals would make me err on the thick(ish) side.
 
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Yeah, I've thought of that as well. A more interesting observation comes when fuel system cleaners are used....it seems to dilute the oil depending on the strength of cleaner. May be a case for going up in viscosity...
 

Shannow

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It would certainly allow race engines to run thinner oils, as 500 miles may entail two or three cold starts, followed by 500 miles of high temperature boil-off. Versus 20 cold starts, and rarely to temp for the rest of us (repeated 10 times on one oil change)
 
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