It is simply a conspiracy to get older vehicles off the streets. They want them to die and do not care whether you like your older vehicle or not. Whether you can't afford a new one or if you just like to keep that Oldtimer/Youngtimer vehicle for fun. They want it gone, and if you don't get rid of it voluntarily, then they gonna castrate the oil so it dies on you no matter what, no matter how good you take care of it. And they won't tell you they did it with the oil, because you're supposed to be stupid and think that it just had it, or make you think YOU killed it yourself.
They do this in secrecy, so you will never know, but D@MN, BITOG is spilling all the secrets. D@MN those dissidents!!!

IMHO opinion, a 90's Stage 1 cat is clean enough to be nice to the environment. All this new cat stuff nowadays is nothing but a farce. The difference is simply negligible, I don't care what anybody says.
This is all just trying to BS the population and marketing.
Not to mention that if the d@mn engine ever starts acting weird, it is almost impossible to pinpoint what sensor or emission related gadget is acting up. Also part of the plan, because most people HAVE to take it to a specialist for big money.

rl153 wrote on 08/09/12 at 16:45:51:

It's a push rod engine without roller lifters,  It does have hydraulic lifters but essentially they wear the same as a flat tappet even though the valve spring pressure is not as high because it is a hydraulic lifter.

So to answer your question, it's up to you,  use the tried and true with a good ZDDP value or use the newer oils that have the friction modifiers and unproven high pressure additives.

Myself on my vehicles I only use a high quality syn such as Amsoil, but I also greatly extended change intervals since the oil and the filtration system can make use of it.

R.F.

The buick holds 5 quarts of oil ,I think valvoline has 800 ppm zddp. How much more redline  zddp ,should I add? Thanks!

Routy wrote on 08/09/12 at 15:01:05:


Because the main and rod bearings have much larger surfaces because they have matching profiles, it's much harder for the oil to be pinched by the mating surfaces. The round cam against a flat tappet? Not hard at all. Try cutting a stick of butter with the knife sideways. Pretty difficult, isn't it? That's what it's like to cut through the oil in a main or rod bearing. Now turn the knife the right way - that's what it's like on a solid cam.

This really is the type of stuff you should do some research on before you run around making claims that there isn't a problem.

Update added to original post, see #8 and link, the link shows what year cars need what.