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glider · Dec 22nd, 2007, 08:14 PM

No laughter here at all,we're all here to share info.

What I have found to work well is the M1 in the engine, spectro in the trans or even redline heavy but I prefer the spectro after trying a few of them. HD formula+ in the primary or any 10/40 oil that does not have friction modifiers in it.

There are many other good oils to use but these are what I found to work well and give satisfactory results.

In your 03 the spectro to use would be the GL1 grade which is formulated for the 5 speed trans.

Check post #11 here.

Oil Suggestions For Harleys - Harley Davidson Community (Oil Suggestions For Harleys)

Dec 22nd, 2007, 08:14 PM	#42
glider Frozen Account Join Date: Jun 21st, 2007 Posts: 25,999 My Mood:	Re: Engine Oil Poll No laughter here at all,we're all here to share info. What I have found to work well is the M1 in the engine, spectro in the trans or even redline heavy but I prefer the spectro after trying a few of them. HD formula+ in the primary or any 10/40 oil that does not have friction modifiers in it. There are many other good oils to use but these are what I found to work well and give satisfactory results. In your 03 the spectro to use would be the GL1 grade which is formulated for the 5 speed trans. Check post #11 here. Oil Suggestions For Harleys - Harley Davidson Community (Oil Suggestions For Harleys)