Posted by DR. EVIL on November 16, 2019 at 06:38:43 from (174.197.8.35):
In Reply to: Zinc in Oil posted by David g on November 15, 2019 at 20:40:55:
When Goss's garage comes on my TV I change the channel. Lots of today's engines come with roller rocker arms and roller bearing pivots. No extreme pressure sliding parts that the ZDDP additive protects. The old flat tappets and sliding rocker arms on these 40 to 90 year old tractor engines have lots and lots of sliding friction. Yes many race engines have high lift camshafts and very strong valve springs to prevent valve float at high rpm, and the racing oils have a strong dose of ZDDP. What they don't have is much of a detergent. Lot of budget drag racers use Shell Rotella in their race engines. It's rated for both spark and compression ignition engines. Last time I called the Shell Oil Answerman ROTELLA had either 1200 parts per million or 1400 parts per million. Probably shouldn't use it on an engine with catalytic converters but might not hurt anything if it doesn't burn oil. The ZDDP additive is very expensive every place I've ever seen it, let Shell put the right amount in the jug. Use the money you save to do used oil analysis, see what wear Metals are in your old oil. See if gasoline, diesel fuel or coolant is getting into your crankcase. I've done a FABCO oil analysis on my 7.3L PowerStroke engine every 10,000 to 12,000 miles since it had 100,000 miles and did the last one at 302,000 miles. I included the tests with the truck when I gave it to SON. Think I'll give him a test kit for Christmas. FABCO is the local CAT construction dealer. Tests taken after I towed heavy with my truck showed high soot in the oil from the heavier load on the engine.
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