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This once useful thread appears to be entering a death spiral.
This one I saw from JVB Productions had a 1/4" of each lobe gone only the width of the follower, the original shape of the lobe was there on each end as a thin slice, and the owner said he really had not noticed a power difference?
View attachment 75034
Holy canoli.
I wonder if the wear is similar on the opposite side of the motor.
BTW I bought an '18 thinking that any bugs would have been sorted out by the end of the model run. After going through GetragHell with a '94 Oilhead, I swore off "Beta Year" BMWs.
Hopefully these failures aren't too common, but I am glad I got a comprehensive extended service agreement.
One YT BMW master mechanic says it's oil related. Use Advantec and nothing will every go wrong. For some reason I doubt that. If an oil meets the spec, it should be good and I've heard of failures with BMWs oil too, so there's that. It's more likely a combination of heat treatment and the path of oil lubrication. Dodge Hemi's have a similar problem and some think it's the position of the lifters, some say there are other factors. Whatever the case, they should have this bucked out already.
A BMW master mechanic would be really stupid to go on record saying something like that. As you said, it's the oil specs or certified rating that matters. The owners manual says BMW recommends "Advantec Ultimate" oil which is API SN /JASO MA2. The oil actually specified by BMW is actually API SL/ JASO MA2. No where in the manual is Advantec Ultimate "Specified".
I use API SN /JASO MA2 in my 1250RT, but it's not Advantec Ultimate. I use Motul 7100 4T 5W40 which is about six bucks cheaper on Amazon than Advantec Ultimate. BMW Advantec Ultimate oil is produced by Shell. Really, if the Advantec really had some additives that the engines required, why would BMW not specify it rather than eat the cost of changing cams and cam followers? The parts alone crazy expensive.
I would not be happy paying more for Advantec Ultimate oil, but I'd shell out the extra bucks for it if BMW said I had to use it to prevent things like premature cam wear. Car makers specify specific brand types for various types of fluids all the time. Of course, that would be admitting that the cams are really substandard.
I like the guy a lot, but we disagree on a couple things. This is one of them. It's a BMW problem, not an owner issue.
A BMW master mechanic would be really stupid to go on record saying something like that. As you said, it's the oil specs or certified rating that matters. The owners manual says BMW recommends "Advantec Ultimate" oil which is API SN /JASO MA2. The oil actually specified by BMW is actually API SL/ JASO MA2. No where in the manual is Advantec Ultimate "Specified".
I use API SN /JASO MA2 in my 1250RT, but it's not Advantec Ultimate. I use Motul 7100 4T 5W40 which is about six bucks cheaper on Amazon than Advantec Ultimate. BMW Advantec Ultimate oil is produced by Shell. Really, if the Advantec really had some additives that the engines required, why would BMW not specify it rather than eat the cost of changing cams and cam followers? The parts alone crazy expensive.
I would not be happy paying more for Advantec Ultimate oil, but I'd shell out the extra bucks for it if BMW said I had to use it to prevent things like premature cam wear. Car makers specify specific brand types for various types of fluids all the time. Of course, that would be admitting that the cams are really substandard.
One YT BMW master mechanic says it's oil related. Use Advantec and nothing will every go wrong. For some reason I doubt that. If an oil meets the spec, it should be good and I've heard of failures with BMWs oil too, so there's that. It's more likely a combination of heat treatment and the path of oil lubrication. Dodge Hemi's have a similar problem and some think it's the position of the lifters, some say there are other factors. Whatever the case, they should have this bucked out already.
That Master Mechanic should be held accountable, For causing a perfectly good Cam Lobe discussion to morph in to an "Oil thread".
My right cams look like this at 41000 miles, left side looks perfect. Always done early oil changes with specified full syn oil.
View attachment 82812
My right cams look like this at 41000 miles, left side looks perfect. Always done early oil changes with specified full syn oil.
Dealer says to keep eye on it. I still have extended warrenty for 16 month, but would like it fixed.
I have a ZDDP zinc additive I use on old airhead, but because of wet clutch, I hesitate to use it.
Joe
View attachment 82812
My right cams look like this at 41000 miles, left side looks perfect. Always done early oil changes with specified full syn oil.
Dealer says to keep eye on it. I still have extended warrenty for 16 month, but would like it fixed.
I have a ZDDP zinc additive I use on old airhead, but because of wet clutch, I hesitate to use it.
Joe
What kind of bike is it? My 2015 GS has 41000 miles on it and you're making me nervous.
Ken
I do not understand how the diamond coating coming off a rocker arm wears a cam lobe?
Can anyone walk me through that?
I do not understand how the diamond coating coming off a rocker arm wears a cam lobe?
Can anyone walk me through that?