Quote:
Originally Posted by SilverGlow
A lot of people that don't understand how oil works think this.
Thinner oil means faster circulation at start up. Faster circulation to the farthest reaches of an engine means less wear. And it is at start up that 90% of engine wear happens. At full operational speeds, the protection that w20 provides is nearly identical to most 30 weights.
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This is an oversimplification on your part. The oil must provide adequate viscosity for the running clearance of the engine design - most critical are the journal clearance and piston to wall clearance. If you run an inadequate viscosity you will easily have catastrophic engine failure. As for margin lube contact wear in cam lobe-to-tappet face, piston top-to- bore, crank flange to journal thrust cap, and unfortunately add for our engines; timing chain sprocket to guide and chain to sprocket. Proper lubrication here relies all on the polar nature of the base oil (most popular syn are NOT polar) and the metal salt extreme pressure additives in the oil. Without them you WILL have premature wear no matter how good your base oil is (Good as in Motul, Redline, Fuchs, ELF NOT Mobil, Pennzoil, BP!) If toyota specs 30w and 20W they are really flirting with disaster. The motor MUST be clearanced for one or the other. Guaranteed we will see a high percentage of spun bearings and collapsed piston skirts with this misguided TSB policy on our 1nzfe engine.
Sonja's Dad
11-04-2008, 01:44 PM
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