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 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles.
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles
Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500