4 Speed tranny oil ?

[ChrisH]

Before anyone stops reading because it's another thread about oil - I have a very specific question:

Since the demise of SportTrans I've always run 20/50 in my primary/transmission on mu 01 Sportster - no problems.

I have also just acquired a very low-mileage 1989 Sportster. Given that it is an old fashioned 4 speed box - does the same advice hold good ?

By the way the reason I am asking the question is that it currently shifts like a pig - going through the previous owners' paperwork it appears from the last service report that they put 10/40 in the tranny - I'm hoping that a heavier oil will fix the problem.

Cheers
ChrisH

[douglr88]

I run a 1986 four speed XLH 1100 Sporty and I now use the genuine Formula+ oil and have never had a problem. It is very heavy changing gear, especially 1st to 2nd but no problems.

[MarlboroMan]

again i have a 89 1200 xlh, wouldnt use any other oil in it thatn harlys own, the engine on the other hand i use mobile or duckhams, 120,000 mils no problems YET!