Yamaha TRX850 Enthusiasts Forum

Oil sight glass is starting to get a bit hard to see through with a slight brown sludge stain. Bike has done about 145,000km. Runs ok but checking oil level becoming a bit of a pain. Should I look at using some form of engine flush, a diesel oil or just leave it to avoid making a small issue worse by loosening up potential sludge? I'm thinking leave it alone but any thoughts?

You `might` be able to fashion a wiping tool from welding rod, gaffer tape and a cotton bud.

Rubes wrote:Oil sight glass is starting to get a bit hard to see through with a slight brown sludge stain. Bike has done about 145,000km. Runs ok but checking oil level becoming a bit of a pain. Should I look at using some form of engine flush, a diesel oil or just leave it to avoid making a small issue worse by loosening up potential sludge? I'm thinking leave it alone but any thoughts?

I'd run a quality oil clean through the engine as that sludge is all through the engine and will reappear even after you wipe it away…….and a new filter after cleaning

Or you could remove the upper oil sump cover to clean the glass, replace the seal and fit back on. A full oil flush + a new filter and you'll be good for another 145000kms!