hi-shear conditions
Senior User
Joined: Sep 2002
Posts: 241
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hi-shear conditions
Does an ordinary dino oil provide adequate protection against shearing when the oil is squeezed away from two sliding surfaces? Is their enough zinc/phosphorus in todays motor oils or has it been reduced too much to protect the catalytic converter? Personally,I say screw the catalytic converter and give the protection to the engine.After all a new cat can be had for around $100.00 but an engine is worth a few thousand.
Senior User
Joined: Oct 2002
Posts: 286
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From: USA
hi-shear conditions
I believe that the SL rated oils do pretty well in High Temperature High Shear tests. Some engines tend to shear the oil more than others, so only testing can tell. I've heard that Toyota V6 engines have a tendency to shear oil, and so Dino might not be the best choice, especially for 5000 miles.
Unfortunately on the issue of the Cat, it would probably cost you more in diagnosis and installation than the cost of the Cat. Then if the dealer found out you were using a non SL rated oil, you might not get it covered under Warranty.
Unfortunately on the issue of the Cat, it would probably cost you more in diagnosis and installation than the cost of the Cat. Then if the dealer found out you were using a non SL rated oil, you might not get it covered under Warranty.
Elder User
Joined: Feb 2002
Posts: 755
Likes: 1
From: Campbell, California
hi-shear conditions
Don't know poopey, how much zinc and phosphorus is enough? My last two oil samples had 800 to 850 ppm of zinc and 650 to 750 ppm of phosphorus after they were drained. Can't say what the quantity of these elements was before the oil was used, and I don't know what the quantities were before cats came along. I do know one thing, if the cat gums up and causes too much back pressure, then you'll be replacing a cat and some head gaskets.
http://dan.prxy.org/Truck/Oil%20Report.htm
http://dan.prxy.org/Truck/Oil%20Report.htm
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