Last week I did and oil change with 4 quarts of Royal Purple 5W-30 and 1 quart of Lucas oil stabilizer. I added the oil stabilizer to keep my timing chain from dragging on start-up until the oil pressure got to the tensioner and right now it has gotten rid of that problem.

But it raised my oil pressure to 30 psi at idle 60 psi at 2000 rpms and 100 psi at 6000 after it is fully warmed up.

The service manual says the pressure is supposed to be around 14 at idle, 30 at 2000 and 60 at 6000.

Is this high of oil pressure a problem and since I live in Blacksburg, Va will the added viscosity of the stabilizer a problem for the occasional winter temperatures of sub zero.

 

You shouldn't need an oil additive to keep your chain from 'dragging' on startup. There's a mechanical catch mechanism in the chain tensioner to keep it from letting too much slack develop. Maybe yours is broken.

The 14psi, 30psi at 2K, and 60psi at 6K are minimums. When warmed up, mine runs just under 30psi at idle and 60psi at 2K rpms. I'll see 90+ on a cold start. It's been that way since new, and I think that's typical.

Some of the oil passages are pretty small, so having too high a viscosity may lead to oil starvation in some places on a very cold start.

 

As mentioned, no need. Also it's never a bad time to not use Royal Purple in a VQ.

 

Who uses royal purple in the z? I have heard nothing but bad reviews and wouldn't let that purple crap touch my vq

 

Oil additives are never a good thing.

As far as royal purple I haven't heard very good reviews my uncle owns a Harley shop and refuses to use it now.

But then there are other people who swear by it

But just remember there are also people who swear by cheap oil