Which Is The Best Oil For Maintaining Hot Viscosity?

what pressure are you getting at tickover (1-1.5K revs) Tricky

 

mmmm if the pressure is that low, I would think about the bearings sooner rather than later or there could be an expensive rebuild in the offing. I though the pressure should be around 20 psi at least. is the oil light coming on??

 

I don't know what oil is recommended for the T160.
My thinking is that when the engine was designed, essentially way, way back before (semi) synthetic oils, only mineral oils were available - Castrol GTX and Duckhams Q20-50 being the regular oils of choice (apart from Castrol R which usually went in the petrol tank by the teaspoonful. Mmmmmm ... highly aromatic!!). These oils worked well enough in my 5TA, Dommi 500 and '69 Bonnie way back when.
Also, I'm sure I read somewhere that modern synth' oils do not always suit older type engines as they are too thin by comparison with mineral oils.
Could it be that one step back will provide two steps forward?
Discuss.

Just thinking out loud!

 

I use either castrol or silkolene 20/50 classic oils in my bikes and change it every year even if i do low miles as its not expensive to do, with the triple i would definitely check the prv for dirt and also fitt a new oil pump.

 

The good stuff IS still available ...

https://www.classic-oils.net/All-Products-by-Manufacturer/Duckhams/

 

I think REDLINE do a 20w60 if you are struggling to find some

 

Gallon cans made of metal. What's not to like?
Ah, but is it still green??

 

Another vote for Duckhams Q 20/50. I run it in my 500/T100P. I also used this in all of the Jaguars that I ran in the 80s and 90s it was the only oil that would stay in the XK engines when used hard. These engines always used oil, with other oils the motor would use a pint in 125-130 miles but Q would give up to 250 miles a pint.

Duckhams for sure.

 

Throw the gauge away and forget about it!
I think the oil pressure light on the t160 is set to about 6psi.

 

At the risk of stating the bleedin’ obvious......

Viscosity is a measure of ‘runniness’. The multigrade number describes hot to cold performance.

Older engines built to wider tolerance with a bit of wear might accept a notch thicker oil. After that, the choice is about oil longevity (synthetic best) and additives from detergents to friction modifiers.

So, by my reckoning, the question is simply about viscosity not temperature (which is assumed).

 

Tricky-Dicky.
I always use the silkolene But when I rode the Harleys I used to get screaming eagle that ran cooler than normal oils supposedly.
Ride Safe
Joe.

 

Since none of.us are.chemical.engineers,.we have to.go.by the numbers. In that context, one oil is as good.as.another. ...J.D.

 

Exactly right, it's no use expecting old engines to maintain high oil pressure at tickover, they never had much even when new. Fitting pressure gages to these old motors will just frighten you.
I have 66 bike and a 1974 car both running perfectly but l know if I fitted gauges l would crap myself!
Sometimes ignorance is bliss!

 

A presumptuous statement, do you know everybody on here?