Doubting Thomas' piss me off, those baastards! One thing I just thought about was how dirty the oil was that came out of the K0 on it's first oil change after 1000 miles. It was Castrol 4T motorcycle oil from memory, and I was surprised because I built the K0 engine from spotlessly clean upper and lower cases, and all the external covers, plus the head and cylinder block had been vapor blasted, and the "guts" I installed were all very clean, yet the oil that came out 1000 miles later looked like it had done 10,000 miles? Another thing I've never noticed using car oil.
I'm with Bryan on the "change both your oil and filter at the same time" point, I can't see any point in running clean oil thru a dirty filter either, filters are cheaper than cheap oil, and considering how filthy the Castrol 4T was after only 1000 miles on a new engine, there's no way I would have left that filter in my engine.
The number 1 killer of CB750's has never been the choice of oil brands, but rather, running bikes with filthy oil. Most of the CB750's I buy arrive dead, and in most cases, the remaining oil is filthy. One bike I bought many years ago had sheep or 'Roo poo in the oil tank, obviously the owner who lived in the country must have pissed someone off. Surprisingly, that engine ran like a timex watch and I on-sold it to another member here, who's still running it in his K1.
I'm about to have new (Fcuking expensive) tyres put on my original 2007 Triumph Rocket III, it's now approaching it's 14th year, and in that time I've done a whopping 14000 Km. (9000 miles) It's only had it's first service (in 2009 after 2 years as my brother bought it new, rode it home, sh1t his pants and never rode it again until he sold it to me 2 years later) then the output shaft bearing failed after 8000 Km (5000 miles) due to a manufacturing fault (not a design fault) and the engine was completely disassembled, repaired, and of course new oil, filter and coolant etc was used. That was in around 2012 or 2013, so in 2015 with maybe 11000 Km I changed the oil and filter using Penrite semi-synthetic car oil, so I've asked the shop to also change the oil and filter, flush and replace the coolant, and flush and replace the brake fluid when they install the new Avon Venom tyres.
Being that I don't ride it enough, I probably won't change the oil for another two or 3 years, unless I attend the "Long Ride" later this year. for raising money for prostate cancer survivors. I've had prostate surgery but didn't have cancer, but I have a lot of sympathy for those guys (like Bobby R here) and it'll be great to do a ride through several states with some other like minded guys along the way. I suppose the good thing about the R3 is that it does 60 MPH @ 2200 RPM, so isn't working hard and testing the limits of the oil.
