why not 10w-40 synthetic oil ??
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Finish filling out your Profile, including the line called "Location" which is where you live.
The outside air temperatures at which you are operating your bike have everything to do with the weight of oil your motor requires.
The manual does not recommend 40w unless you're in a northern "winter" climate, and even then it's the bottom number, 10w, 15w, 20w, etc that's most important.
The outside air temperatures at which you are operating your bike have everything to do with the weight of oil your motor requires.
The manual does not recommend 40w unless you're in a northern "winter" climate, and even then it's the bottom number, 10w, 15w, 20w, etc that's most important.
Last edited by cHarley; 09-04-2009 at 07:31 PM.
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According to my HD manual, the following are the preferred oil viscountcies listed in descending order: 20w-50, 15w-40, and last, 10w40.
I'm not sure how much you know about oil viscountcies and temperature, but I'm assuming your purpose for going to 10w-40 is for easier cold morning start-ups. A suggestion for a better compromise would be to run Mobil-1 15w-50 (silver cap) automotive synthetic. I run it year round in my bike in temps that range from the 30's - 100*. This gives you a lower end number (15w) to aid in cold starting and you still have a 50 on top to handle those occasional warm snaps during the late fall & early spring months. Even though it's not labeled as a V-Twin oil, many oil analysis tests have shown it to perform right up there with the best of the $$$$ boutique V-Twin synthetics. You can get it at Walmart in a 5 quart jug for about $23.00, which is $4.60/ quart.
Since it's the early morning cold starts that are the hardest, where is your bike stored overnight, inside or outside?
Last edited by cHarley; 09-05-2009 at 06:09 AM.
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That being the case, you might want to consider parking the bike on a sheet of plywood put down on top of the concrete slab. It will act as an insulator between the chilled concrete and your controlled environment under the cover. It will also significantly reduce condensation formation under the cover. Concrete loves to suck up and retain moisture.
Last edited by cHarley; 09-05-2009 at 08:06 AM.