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Originally Posted by skywagon
While you are on the DOHC 16 valve subject, just got my new service manual and was going thru it, and can you beleive this sh$%? Solid lifters that need adjusting, and to adjust you need to remove both camshafts and install different size lifters. How hokey is this in this day and age???? removing both camshafts gets you into the cam chains and tentioners, i bet it is a big $$$$$ job.  |
Hi Greg - This actually deserves it's own thread... DOHC systems are almost always mechanical followers. All the more reason to use a Zinc anti-wear additive (ZDDP).
To find ZDDP in oils other than those that are certified for Diesel Engines or Off-Highway use (racing) is getting pretty rare.
You can, however, use something that goes into all our racing engines these days. STP. It's the original Zinc additive. I don't know how they escape the EPA but they do. Some people are concerned that the STP will "thicken" their oil. This is not really the case when used as advised. The product is a viscosity index improver and high detergent stabilizer. How much stability it adds to today's oils is anyones guess.. I can tell you that since we went back to using it a few years ago - we stopped having camshaft (flat tappet) failures.
The other thing to consider is the low load factor of the followers. The valve springs on these engines are most likely very low tension to minimize internal friction.
STP goes into all my vehicles now and the real beauty of it is that it's pretty widely available and doesn't cost that much.. It will be going into my TCH.
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So I won't be a total thread hijacker;
Of all the emblems I really don't like the Toyota logo and I especially don't like how they used it with the front grill - making it look like an afterthought..