Quick Question About Mixing Oil Viscosity - Page 2 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #11 of 14 Old 11-16-2017, 06:05 AM Thread Starter
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Well I have to say that my friend's opinion that synthetic oil's uniform molecule makeup being more prone to cause leaks did give me pause. Only because of all of the instances I've read here over the years of new owners changing their oil and dealing with slight leaking from the oil filter cover gasket in their CBR's. While most of the time simply torquing down the oil filter cover bolts a little more is enough to solve the problem, we're all well aware by now how brittle those bolts are and how easily they can fail from over-tightening. So even if I didn't fully believe that my friend's warnings were fully valid, it's difficult not to weigh the "worst case scenario" possibility of a broken oil filter cover bolt against the advantages of running synthetic oil in the bike.
At this point in the ownership of my 2011 CRB, I've completed numerous oil changes without incident or the slightest hint of oil leakage after changing the oil filter cover gasket. I'm well versed in how much "hand tightening" of those bolts is required to do the job without "over doing" things and ending up with a disaster, so I guess my last lame excuse for not running Rotella in this bike has finally bit the dust.
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post #12 of 14 Old 11-16-2017, 05:01 PM
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synthetic wont cause leaks
past normally tightened covers..
equally tightened in sequence [1,3,2,4]
will create a good seal, as designed..
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post #13 of 14 Old 11-16-2017, 05:27 PM
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Quote:
Originally Posted by cbrlocal View Post
Additive packs are fully compatible with one another; no need to fret changing oils or brands or viscosities or conventional to synthetic. Besides, the amount left of the old oil after a drain is very minute, and nothing to worry about.
Not from one brand to another when mixing in equal amounts. In a "pinch" it's better than running low, but that's about it.

Whatever is left inside the engine during an oil change is insignificant, but mixing 1 qt of this and 1 qt of that isn't a good idea IMO.
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post #14 of 14 Old 11-20-2017, 04:03 PM
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Quote:
Originally Posted by TrueFaith View Post
Well I have to say that my friend's opinion that synthetic oil's uniform molecule makeup being more prone to cause leaks did give me pause. Only because of all of the instances I've read here over the years of new owners changing their oil and dealing with slight leaking from the oil filter cover gasket in their CBR's. While most of the time simply torquing down the oil filter cover bolts a little more is enough to solve the problem, we're all well aware by now how brittle those bolts are and how easily they can fail from over-tightening. So even if I didn't fully believe that my friend's warnings were fully valid, it's difficult not to weigh the "worst case scenario" possibility of a broken oil filter cover bolt against the advantages of running synthetic oil in the bike.
At this point in the ownership of my 2011 CRB, I've completed numerous oil changes without incident or the slightest hint of oil leakage after changing the oil filter cover gasket. I'm well versed in how much "hand tightening" of those bolts is required to do the job without "over doing" things and ending up with a disaster, so I guess my last lame excuse for not running Rotella in this bike has finally bit the dust.
Yep; I've never had my bike leak a drop of oil, and I've never changed the metal reusable oil filter gasket yet in 33k miles. I simply make sure it's clean and dry. I think the oil type causing a leak there is particularly hard to believe, especially since it's a metal formed gasket and not rubber, which can and does become brittle over time. Switch away; your bike will love it.
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