Unscientific Oil weight study - Honda Rebel Forum
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post #1 of 23 Old 11-20-2018, 10:45 PM Thread Starter
 
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Unscientific Oil weight study

Ok back in June I installed a Magntic Plug in my bike purchased from Good old bear ebay very nice unit with a super strong magnetic guess itís called earth magnet or whatever any way Nicely made. So for 1000 miles I ran Honda 10w 30w oil when I changed the oil the magnet was loaded with metal chips. I then changed the oil to Honda 10w 40w ran another 1000
miles and had some metal chips about half as many. Then changed the oil to Castrol Dino 20w 50w 1000 miles later change the oil no metal chips. Changed the oil today back to Honda 10w30 weíll see what happens when I change it. Now I live in west Florida and it is very hot and humid here. I just found this interesting. The most affordable 20w 50w did the best but maybe not Iíll run the test again see what happens. The bike has 44,000 miles on it.

Thanks so much!
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post #2 of 23 Old 11-20-2018, 10:55 PM
 
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My analysis of your findings would be that you have been gradually cleaning out all the accumulated metal chips in your sump from day one of your engine up to the first oil fill after you installed your magnetic plug. It makes sense that you will catch the most on your first oil change, and gradually less and less until you are seeing only the current crop of new chips on each oil change. It has nothing to do with the weight of the oil. I would stay with the 20W50 weight on an air cooled engine.
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post #3 of 23 Old 11-20-2018, 11:06 PM Thread Starter
 
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I agree with you going to try ome more time. I donít notice any noise diff between oils or shifting diff. But living in Fl I should stay with 20w 50. Gets so hot here some days fell like Iím driving in a convection oven.

Thanks So Much!
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post #4 of 23 Old 07-13-2019, 03:42 PM
 
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I am curious if you changed your latest 10-30 oil again yet?

I am also surprised at the oil weight recommendations here. The owners manual for my 2016 states clearly that 10-30 should be used. No alternative oil weights are offered for higher or lower ambient temp ranges - - which I found odd.

I am needing to do the first oil change on my new-to-me bike. It has <500 total miles on it. I had assumed to use 10-40 given the wide swing between winter and summer temps here in the mid-Atlantic region. Now I am in doubt - - I generally stick to the oem manual recommendation.

2016 Rebel 250 - - Black
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post #5 of 23 Old 07-13-2019, 04:39 PM
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See post #8 in this link: https://www.hondarebelforum.com/f28/...oil-41242.html

Pretty sure this is from an earlier Honda Rebel owner's manual, but haven't heard from Buickguy in a while so unable to confirm. BTW, Buickguy put over 100,000 miles on his '87 CMX250 with no engine repairs. Hard to argue with success like that. Unless they are motorcycle specif, and therefore inherently overpriced IMP, all XX-W30 oils in North America contain friction modifiers that will cause the clutch to slip

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #6 of 23 Old 07-13-2019, 05:33 PM
 
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Quote:
Originally Posted by flitecontrol View Post
See post #8 in this link: https://www.hondarebelforum.com/f28/...oil-41242.html

Pretty sure this is from an earlier Honda Rebel owner's manual, but haven't heard from Buickguy in a while so unable to confirm. BTW, Buickguy put over 100,000 miles on his '87 CMX250 with no engine repairs. Hard to argue with success like that. Unless they are motorcycle specif, and therefore inherently overpriced IMP, all XX-W30 oils in North America contain friction modifiers that will cause the clutch to slip
Thanks. I'd sure like to know if that oil chart/table he posted was truly from a Rebel manual.

As mentioned, my manual doesn't offer any alternatives for different ambient temp ranges. It just says to use 10-30. Period.

Our local auto-parts store doesn't even carry 10-30 motorcycle oil. They had 10-40 and 15-50. I went with a full synthetic 10-40 (Mobil 1). Based on the chart that Buickguy posted, 10-40 should cover me for all my temp ranges, winter and summer. I sure hope that's okay.

I realize the synthetic is probably not necessary given the recommended (here on the forum) oil change interval. But it was on sale and the other non-synthetic 10-40 motorcycle oil was a generic store brand. New bike, figured I'd treat it nice.

Btw, my 2016 manual recommends an oil change interval of 4000 miles!

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post #7 of 23 Old 07-13-2019, 05:41 PM
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FYI, we recently had a couple of members post about their clutch slipping after using full synthetic oil (think it was Mobil 1) in very low mileage Rebels. Synthetic oil really isn't needed in an engine that should have frequent oil changes. In the only head to head comparison of automotive oils and motorcycle oils, the automotive oils performed better. If you listen to a salesman at a dealership, he'll lead you to believe the engine will blow up if it's fed non-motorcycle specific oil. Actually, what happens is the dealership makes a lot more money on these overpriced oils that are no better at protecting the Rebel engine than conventional oil.

I use 15W-40.

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #8 of 23 Old 07-13-2019, 06:08 PM
 
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Quote:
Originally Posted by flitecontrol View Post
FYI, we recently had a couple of members post about their clutch slipping after using full synthetic oil (think it was Mobil 1) in very low mileage Rebels. Synthetic oil really isn't needed in an engine that should have frequent oil changes. In the only head to head comparison of automotive oils and motorcycle oils, the automotive oils performed better. If you listen to a salesman at a dealership, he'll lead you to believe the engine will blow up if it's fed non-motorcycle specific oil. Actually, what happens is the dealership makes a lot more money on these overpriced oils that are no better at protecting the Rebel engine than conventional oil.

I use 15W-40.
Oh nuts! I haven't done the oil change yet, and I can return the oil. But what a pain.

I think 10-40 is the right weight given where I live, but clearly I need to read up some more on specific recommendations for which brand/grade oil to purchase. I want to get this right.

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post #9 of 23 Old 07-13-2019, 07:20 PM
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Many of the members here use Castrol XXW-40 or Shell Rotella. Rotella is JASO certified for motorcycles. JASO is a Japanese standard for oils suitable in four stroke motorcycle engines. Not sure if Castrol is, but it's what Buickguy put in his 100,000 mile+ Rebel. Just because an oil doesn't have a JASO certification doesn't mean it's not a good oil. The certification process is expensive, and the manufacturer may think it's not worth the expense for a relatively small market share. A lot more oil is used in cages than in motorcycles

Be glad you didn't use the synthetic!

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #10 of 23 Old 07-13-2019, 07:45 PM
 
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I get the Honda GN4 10-40 from the local Honda Dealer. South Central NY State. I don't ride when it is below zero obviously. It does hit 90 now and then in the riding season. I mean at $6 a quart and no problems with the '86 all these years. Almost 11,000 miles--changed every 1,000. Keep it simple--things will get difficult on their own.

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