HD's M8 vs Indian's 108cu.in. oil consumption - Road Glide Forums
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post #1 of 21 (permalink) Old 11-17-2019, 01:45 PM Thread Starter
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HD's M8 vs Indian's 108cu.in. oil consumption

Per various posts and first hand knowledge Harley's brand new M8 engine design does burn oil.

Apparently, Harley has issued a Technical Bulletin (TB) that allows the M8 engine to burn one quart within 1,500 miles; this amount of engine oil burn is considered to be OK.

Question: Does Indian allow their 108 cu. in. engine to burn oil like the Harley's?

The # of MOCO's TB is unknown, if someone has the TB # please post.

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post #2 of 21 (permalink) Old 11-17-2019, 01:50 PM
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Bro I hate to tell you but this is nothing new.



Check the date.

Sell that POS Harley and get an Indian. I hear they actually produce oil as you ride them so you can drain some off and save it for later. Way better deal.


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post #3 of 21 (permalink) Old 11-17-2019, 02:38 PM
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Ok..... I hate to jump into this as it's been discussed on several other oil threads. If you go talk to about any other auto manufacturer they will tell you the same thing. Even BMW motorcycle will tell you that amount can be considered normal. This does not mean that the manufacturer is saying that all M8' use this much oil. In fact, most don't even come close to that. Move on to another topic if you are trying to justify buying the Indian.

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post #4 of 21 (permalink) Old 11-17-2019, 02:42 PM
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Not sure why oil consumption is so much greater with M8s compared to Twin Cams. Iíve had 4 Twin Cams and never burned oil close to that. However if a quart every 1500 miles is considered normal, I could probably deal with that. But one guy posted that during a 2600 mile trip he had to add 4 quarts. That canít be normal! Would that be a sumping problem?
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post #5 of 21 (permalink) Old 11-17-2019, 02:49 PM
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Quote:
Originally Posted by Desert Rider AZ View Post
Not sure why oil consumption is so much greater with M8s compared to Twin Cams. Iíve had 4 Twin Cams and never burned oil close to that. However if a quart every 1500 miles is considered normal, I could probably deal with that. But one guy posted that during a 2600 mile trip he had to add 4 quarts. That canít be normal! Would that be a sumping problem?
Most likely was sumping. That is becoming old news now though as there have been various fixes and it just doesn't show up anymore and it wasn't nearly as prevalent as the internet and some aftermarket shops led people to believe. Granted it should have never been an issue but even BMW is going through a pretty big recall with a trans issues on the K1600's. It happens.....

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post #6 of 21 (permalink) Old 11-17-2019, 03:55 PM
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Quote:
Originally Posted by Desert Rider AZ View Post
Not sure why oil consumption is so much greater with M8s compared to Twin Cams. Iíve had 4 Twin Cams and never burned oil close to that. However if a quart every 1500 miles is considered normal, I could probably deal with that. But one guy posted that during a 2600 mile trip he had to add 4 quarts. That canít be normal! Would that be a sumping problem?
I never had to add oil in any of my twin cams and so far, I haven't had to add oil in my M8. Because "one guy posted" it, that doesn't means it's common or even true.


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post #7 of 21 (permalink) Old 11-17-2019, 05:02 PM
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i've never had a bike that i've had to add oil between 5,000 mile oil changes. and since 2002, i've owned 9 bikes (well, between the wife and i).

if the oil level changed, it was minimal. not like it started at full and at the oil change was down near add.
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post #8 of 21 (permalink) Old 11-17-2019, 05:16 PM
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Neither one of my 19s use any oil in between oil changes. My 16 didnt use oil. My 84 Shovel didnt use oil. My 48 Pan used oil. (Indian was still in business when that bike was built) and a few of my other Shovels did. Who cares what the Indian does?


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post #9 of 21 (permalink) Old 11-17-2019, 08:03 PM
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1 qt every 1500 miles is bull shit!


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post #10 of 21 (permalink) Old 11-17-2019, 08:24 PM
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No mechanical reason for an M8 to burn more oil than a twin cam. Its basically the same ring package with similar clearances. Perhaps I should say published clearances. But oil consumption would be a symptom of sumping. It might also be a symptem of a leaking gasket on a piston jet. Spraying the cylinder wall as opposed to the underside of the piston.

With that said, the M8 breather valve is a real piece of work. And the MoCo knew it. The M8 air box is built so that it holds the carry over oil in the throttle body throat as opposed to letting it drip all over the side of the scooter. I have no idea as to how much oil the bad ones are passing, but have seen several that had filled that low area and were beginning to back up into the plastic throttle body.

Some breathers have been found with cut orings and some have been found improperly installed. But I doubt that was the whole issue, despite what the MoCo has to say about it. Now the problem is that changing that little piece of plastic crap involves the EPA,CARB, and the EU. So I doubt it happens unless the oil use becomes more of an issue that it is now.
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