Nulon Full Synthetic 15W-50 Street and Track Questions & Answers

I would be very careful using this oil in a motorbike as most have a wet clutch and gearbox which runs in the same oil as the motor, can cause clutch slip and gearbox problems. Use only a recommended oil for bikes like Motul or similar synthetics for bikes ONLY!!

Today I had a discussion with a specialising BMW motorbike mechanic about this oil and his recommendation was this particular oil. Any oil, other than some treated with friction modifiers, generally 0W30 or 10W30 types, can be used as they do not affect the clutch. One thing to be mindful of 15W50 oils is they are thick at cold start up and this particular Nulon oil has a high cSt value at 40C. Most Japanese bikes require a 10W30 or 10W40 as their engines have close internal engine tolerances. My BMW requires 15W50 but once hot still sounds like a can of nuts & bolts being shaken, even with 50 weight oil.

I would not use this in a late model Japanese bike unless recommended by the manufacturer.

Older/high KM engines should be OK.

Sorry, double post due to sign in issue.

Have now had this oil in my bike for 4000km+ and no clutch issues. The gear change feels a bit clunkier than with Penrite. The Nulon has moly in it and i have since read that moly can affect the internal surface coatings of BMW engines so i will be going back to Penrite, mainly because i still have some Penrite from before.

Nulon is a group 3 synthetic whereas the Penrite i use is a true synthetic 100% PAO (Group 4) and Ester (Group 5) and supposedly does not sheer down. Motorbikes that use the same oil for the transmissions kill most oils and a 40 will sheer down to 30 or less within a couple of thousand kilometers. Not good.