TR2/3/3A Adding STP to Castrol 20W50 oil?

[karls59tr]

Does anybody use the STP additive in this oil and find it beneficial?

 

[Sarastro]

I'm not a fan of any oil additives. Oil is formulated with great care, and anything it needs is already there. Get a good quality, name-brand oil and it will have everything you need.

There are loads of stories of oil additives damaging engines.

 

[Geo Hahn]

Andy G liked it. I never did.

 

[Hamish Racing]

In my mind oil additives are a last ditch attempt to solve an issue that a rebuild will sort out.

even cheap oils nowadays are better that the period oils of the ‘50’s and ‘60’s.

but I do prefer a mineral oil to a synthetic and plenty of ZDDP

 

[poolboy]

The TR6 holds about 5 and 1/2 quarts...of that is 8 oz of STP...I just like the way it makes the Valvoline or Kendall 20w-50 feel a little more slippery.

 

[glemon]

I used to use it in my old cars with tired engines to bring oil pressure up. It seems like it would add 5-10 pounds for a while then would break down or whatever and I would be back where I started.

I have decided if you need a rebuild you aren't going to find it in a can.

If your engine is in good shape it should be fine with regular 20w-50.

Either way don't see a good case for using it.

Years ago I used a mixture of STP and motor oil to "upgrade" my lever shocks, which were wearing out. That actually seemed to work pretty well.

Greg Lemon
TR250

 

[PAUL161]

STP was used by many back in the 50s and 60s, including me, but today's oils are quite superior in quality, and additives are not needed. If you need to thicken the oil it's possibly rebuilding time.