What type of oil should I use in my Jonway?

by Jacques Drouet
(Gladstone, OR. USA)

I own an NST mfg'd by Jonway 50cc QMB139 engine. no owners manual, inspection tag says oil-10w40 so I use Castrol as in everything. Castrol says no! Been running Castrol for 1500 miles.


What oil should I be using? Never behind in oil changes 620 miles

Thanks in advance

Comments for What type of oil should I use in my Jonway?

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Oct 11, 2014
 Oil type to use in Jonway 150 cc . NEW
by: Wally

I put synthetic oil in my scooter after 300 miles thinking it had to be best.That evening,before I even rode it after the change,I just for the heck read a few forums about oil,and low and behold,one said not to use synthetic oil in the Chinese scooters because the metal to cast the case was cheap and porous,and that synthetic oils molecules were so small they could leach thru the metal.Said you should stick with normal oil,10/40 -15 weight 40.Went outside,knelt down and looked,synthetic oil was dripping off the bottom of the case.I drained it,refiled with regular oil,910/40,Valvoline and cleaned it all up,no leaks eversince
May 16, 2010
 Oil
by: Anonymous

I use 10W40 four strokes synthetic in my 150cc Jonway. I have about 25,000 miles on my engine. No problems as of today.
Feb 18, 2010
 Good Oil
by: Jim Zeiser

Do not use synthetic until 1,000 miles, first. Second, most of us say 15W-40 is best, after that 10W-40. It supplies the best viscosity for a high performance engine.

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