Bought an 08 FLHT 15 months ago. Used synthetic oil ever since break-in. Always seemed a little noisy, and at 25,000 miles a lifter collasped and they changed out all four. Then on a trip out west at 34,000 miles the primary bearing went out and was replaced in South Dakota. The service manager told me that most of the trouble he has seen on the twin cams were ones that used synthetic oil, so I changed back to dino oil and lo and behold the motor ran like a swiss watch with ZERO top-end noise. Guess I'll try the dino oil for a while. Any one have this happen?

 

This could get nasty..

 

Good thing there isn't anything good on TV tonight. Now I have something to watch. LOL Really tho, I switched back to dino in my old 2001 and it was allot quieter then with syn. Now my 2005 runs quiet on either. Unless there is some kind of a charting system that the service providers put together and than add to a national list there is no way you can say it is all caused by using syn or dino. Just my opinion.

 

I hope not. I'm not saying one oil is better then the other. Just stating facts and wondering if anyone had the same expierance.

 

some oils are "noisier", Mobil 1 being about the worst IMO.

I run Redline 20w50 and have no complaints.

 

damn im running moibil 1 .. Dear Abby wtf should I do ?
Dave

 

I think I will go pop some popcorn.....This is going to get good!

 

Dear Dave,
Wear earplugs
Abby

 

let me know what she says
Dam:icon_laugh :: icon_laugh::ic on_laugh:

 

I switched from mobil 1 15/50 to castrol GTX 20/50 this last weekend mainly because walmart didn't have any mobil1 in stock that day and I think my lifter noise is now less as well. Maybe it's a bit thicker or something or it has some additive. Whatever, just my observation. It was also 1/2 the price so I'm gonna stick to dino from now on.

BTW, your primary bearing failure was probably due to dreaded bearing skate.