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Author Message   Earwig Posted on Sunday, June 12, 2011 - 03:44 pm:        I don't know what type of oil is in the Uly I just bought. If it gets low is it OK to put in Harley synthetic (it is what I have on hand)? It may have standard/non-syn oil in it now; I'm not sure. I am going to change the oil soon but probably not for a few weeks. Thanks.   Terrys1980 Posted on Sunday, June 12, 2011 - 03:54 pm:        The bike will be fine.   Earwig Posted on Monday, June 13, 2011 - 12:11 am:        So, it's safe to mix standard oil with synthetic? Thanks.   Froggy Posted on Monday, June 13, 2011 - 12:42 am:        I recommend you change the oil, i do it as a rule in general with a new purchase. I don't care if the seller has a video of Erik Buell personally changing the oil that same day, I rather be safe than sorry. Who knows what oil is being run in it.   Firebolt020283 Posted on Monday, June 13, 2011 - 12:43 am:        I am not sure about harley syn. But I know amsoil and mobil 1 bottles both say it is ok.   Dmp0001 Posted on Monday, June 13, 2011 - 01:10 am:        Better mixed oil than low oil. But change it soon.   Earwig Posted on Monday, June 13, 2011 - 01:47 am:        Thanks guys.   Slaughter Posted on Monday, June 13, 2011 - 07:42 am:        I refuse to comment since you have a Uly and I do not!   Wjcunning Posted on Monday, June 13, 2011 - 11:49 am:        Nope. Mix only in an emergency, and change it out ASAP. Single (fork and knife) crank pin engines generate excessive stress at the outer connecting rod. Mixing synthetic and non-synthetic lowers the sheer resistance of the mix, and will lead to unusually "hot" spots at the connecting rods. You won't feel it or hear it, but it will seriously effect the life of the bearing surfaces.   Bumblebee Posted on Tuesday, June 14, 2011 - 04:29 pm:        Synthetic and Dyno oil can be mixed safely. Some say it's the best of both words.   Earwig Posted on Tuesday, June 14, 2011 - 09:15 pm:        Well, I now know it is the best of both worlds and totally safe... and also horrible and not safe at the same time. This clears things up! Thanks guys!   Wjcunning Posted on Wednesday, June 15, 2011 - 02:58 am:        Blended oils are common, especially in the automotive world. In pressurized water cooled engines, mixing is less of an issue because bearing surface temperatures are typically far less than in highly stressed air cooled performance motorcycle engines like Buells. Automotive metallurgy is also more forgiving, by design. Commercial oil blends are formulated with complimentary additives to enhance wear resistance, oxidation, viscosity modifiers, pour point depression, seal swell, detergent action, fluid dispersion, and preferential surface absorption (among others). About 80% of the base formula can be blended without issue, it's the additive mixing that is problematic, and in some cases, damaging. If you get conflicting recommends from forum folks, do yourself a favor and spend some time reading on bobistheoilguy. Google it. Read what the chemist/engineers/metallurgists write, not what The People of Walmart write. Your answers are there. Enjoy.

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