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You know you're essentially making Rotella T5, right? But I like It.
Post Your Latest (Motorcycle) Oil Change!
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You know I showed you how to average numbers when you did a similar mix, right? Add both of the low numbers and divide by two. It's a 10w on the low end if all else is equal.
For percentage change: Find the difference between the beginning number and the ending number, then divide by the beginning number. Then multiply by 100. Going from up 5w to 10w is a 100% increase. If going down from 15w to 10w, that's a 33% decrease. Respectfully, those are not hitting the target of essentially T5 15w40. With respect to a semi synthetic blend yes, in terms of potential oil grade if all else is equal, it's not.
For percentage change: Find the difference between the beginning number and the ending number, then divide by the beginning number. Then multiply by 100. Going from up 5w to 10w is a 100% increase. If going down from 15w to 10w, that's a 33% decrease. Respectfully, those are not hitting the target of essentially T5 15w40. With respect to a semi synthetic blend yes, in terms of potential oil grade if all else is equal, it's not.
^^^ Or you could use the Widman viscosity mixing calculator, which will give a more exact answer of the viscosity at 100C, 40C or -5C.
https://www.widman.biz/English/Calculators/Mixtures.html
https://www.widman.biz/English/Calculators/Mixtures.html
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T5 10W-40
I suppose so.
Well .. That might depend on the actual synthetic content of T5 oils. I'm guessing the 50/50 mixture of T4/T6 will have higher synthetic content, but who knows ??
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True. At least making your own you know for sure.
Agree. My response about the T5 mix in post 822 was saying it is a semi synthetic mix with respect to half conventional and half full synthetic. However not making any deliberate comparison to how much synthetic T5 might have itself. The main point was with respect to the grade of the oil a person would end up with all else equal. I ran the 100 CST through that calculator in the above post, best I can tell it's a 12.5w on the low end. If that floats the boat, then sail on!
2008 Yamaha Royalstar venture 1300 (fathers 2nd bike), drained out Rotella 5w40/15w40 mix, removed a Pg 4612 filter.
Refilled with 15w40 T4 5w40 T6 mix and a fram drive 6607 filter, looked like an encore.
2006 Yamaha R1, removed. Pg4612 filter, drained Out some kind of Rotella, not sure what mix I had in it.
Refilled with 15w40/5w40 Rotella mix and another Pg4612 filter
Refilled with 15w40 T4 5w40 T6 mix and a fram drive 6607 filter, looked like an encore.
2006 Yamaha R1, removed. Pg4612 filter, drained Out some kind of Rotella, not sure what mix I had in it.
Refilled with 15w40/5w40 Rotella mix and another Pg4612 filter
a friend of me 286.000Km with same engine, like a TAXI
Motul 300V Factory Line good oil,
in your photo, the oil you post takes a bit colour (looks that you running it a bit)
Yep! I rode about 200 miles immediately after changing the oil before getting it on the lift to check the level when I shot this photo. I was impressed how well I nailed it right at the full mark.a friend of me 286.000Km with same engine, like a TAXI
Motul 300V Factory Line good oil,
in your photo, the oil you post takes a bit colour (looks that you running it a bit)
CleanSump
Site Donor 2026
It's more interesting if you tell us the miles on the oil, miles on the bike, and what oil was drained, please.
Edited because my shift button is getting stiff.
Engine 6.800km only (4200 miles)
Until now the Katana Scoot 0W30 used for 200km approximate,
before the oil used was Honda 10W30 JASO MB mineral
I don’t know how it called in USA or somewhere else, and don’t know typical properties tech data and who manufacture for Honda
This oil was inside engine for 2000km up down
