BMW K bikes (Bricks)

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101Back to top Go down    Re: Engine oil for K100 on Sat Mar 01, 2014 10:43 pm

92KK 84WW Olaf


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25 W 60 is way too thick for the engine. The oil pump will pump it but the engine needs a thinner oil. Get it out fast and put back in the thinner oil. An oil that's too thick will starve the bearing surfaces of oil. K engines are built to good tolerances. Even in a hot climate you would never use one of those oils. The knock is most likely before the oil pressure builds up on the bearings and possibly the tensioner.

    

102Back to top Go down    Re: Engine oil for K100 on Sat Mar 01, 2014 11:08 pm

duck

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I agree that "lifetime" trans oil is BS. My brother's 525 car has that and I don't buy into that. It's a known fact that oil breaks down over time and miles.

My understanding is that "high mileage" oil contains some additives the helps swell/seal old rubber seals.

I've never heard of a K bike failing for oil-related reasons. You could probably run them on peanut oil and not have a problem. (That's a joke, not a suggestion.)


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

103Back to top Go down    Re: Engine oil for K100 on Sat Mar 01, 2014 11:59 pm

92KK 84WW Olaf

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Most modern engines only use a 5 or 10w grade oil. A 25w is quite thick and takes longer to build up pressure from cold. Over time with stop start that increases wear. To use that grade in winter would definitely not be good, I still would not put that oil in. I can't remember which grade goes in but I think mine is on 10w40. The K does go back to 1983 but the engine was quite advanced at that time. The oil pu

Whatever about the oil I reckon it is the cause of the knock because I have come across that before.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

104Back to top Go down    Re: Engine oil for K100 on Sun Mar 02, 2014 2:30 am

K75cster

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@BritMotorWorx wrote:
bikerboy wrote:

@Kyle10 wrote:

Many people believe that higher-mileage engines benefit from thicker/heavier oils, which is not really true. Contrary to popular belief, thinner oils work far better in that they lubricate better on startup and continue to lube smaller passageways better throughout the heat cycle.

That being saidK75cster, would a thicker oil leave a heavier deposit on worn parts in an older motor for the next start up? Also as the engine wears wouldn't a thicker oil leave a thicker film around the worn parts thus reducing vibrations caused by the greater tolerances? I have added Morey's engine oil conditioner to my old Honda car and it noticeably quietened the engine noise and it is very slippery,sticky stuff! My old Beemer has over 60,000 miles and always wondered about additives in old motors to thicken the oil slightly, at the same time leaving a thick oil deposit on all surfaces for start up? scratch






Yep I would think so, but I liked the morey's gearset sample model sitting on the counter of the spare parts store and would turn the handle everytime I went in there, would have to think it would do for our bikes what it did for the cars I put uit in. Bikerboy I would put diesel in the tank not to use as fuel but to keep the tank clean, but then again that might be a farce as well as using it to stop the pump drying out, anyone want to advise??


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

105Back to top Go down    Re: Engine oil for K100 on Sun Mar 02, 2014 2:39 am

RicK G

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Here is the O'Fishal guide to oil


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

106Back to top Go down    Re: Engine oil for K100 on Sun Mar 02, 2014 2:41 am

rawdonball

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My take is that if your radiator is up to handling the heat transfer load in worst case scenario then better to minimise heat loss from otherareas like engine surfaces. Operating temperature will be reached more quickly from cold start and rate of cooling when engine off will be slowed.
My Isuzu diesel had a thermal jacket covering most of the block, head and rocker cover - I think an indication that it was designed with longevity as a primary consideration. Had to be good for something as it only developed 55kW from its 2.5 litres (diesel!)


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

107Back to top Go down    Re: Engine oil for K100 on Wed Mar 05, 2014 1:28 am

GeorgeDaBikie

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92KK K100LT 193214 wrote:25 W 60 is way too thick for the engine. The oil pump will pump it but the engine needs a thinner oil. Get it out fast and put back in the thinner oil. An oil that's too thick will starve the bearing surfaces of oil. K engines are built to good tolerances. Even in a hot climate you would never use one of those oils. The knock is most likely before the oil pressure builds up on the bearings and possibly the tensioner.
changed oil to 10w 40 and the old girl is back to her old self. thanks for that

    

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