Both companies went to high-lift camshafts and both got into camshaft scuffing and wear problems very fast. In the mid-1950’s, Oldsmobile got into a horsepower war between its Rocket engine and the Chrysler Hemi. The phosphorus levels of oils that passed the test were in the 0.03% range. The insert-bearings were weighed before and after test to evaluate weight loss due to corrosion. Starting in 1942, a Chevrolet Stovebolt engine with aftermarket copper/lead insert-bearing connecting rods was used for the standard engine oil qualification test. Zinc dithiophosphate was first added to engine oil to control copper/lead bearing corrosion. For this reason ZDP levels have been reduced by about 35% over the last 10-15 years down to a maximum of 0.08% for “Starburst”/API SM oils. Unfortunately, ZDP contains phosphorus, and phosphorus is a poison for automotive catalysts. ZDP has been used for over 60 years as an additive in engine oils to provide wear protection and oxidation stability. The anti-wear additive being discussed is zinc dithiophosphate (ZDP).īefore debunking this myth we need to look at the history of ZDP usage in engine oil. This one has gotten big play in the antique and collector car press lately. And this brings us to the latest myth – new “Starburst”/ API SM engine oils are bad for older cars because the amount of anti-wear additive in them has been reduced. Over the years there has been an overabundance of engine oil myths.Īll of these myths have a common theme newer oils are bad. Myths are ill-founded beliefs held uncritically by interested groups. It is SAE document #86 if you care to locate it and read in greater detail. "How about some real facts about Zinc levels from a SAE paper titled "How Much ZDP is Enough?". But read an article from the experts on the current oil standards rather than from the chicken littles of this world. You should note that the current grade oils must prove that they do not affect wear on flat tappet cams to get the SAE rating. This following article was produced by SAE, you know the people that actually set the oil standards. At 1600 rpthe Royal Purple oil required about 5% less fuel than Shell Rotella 15w/40, and about 3% less fuel than Amsoil North Carolina State University for NC Department of Administration, Energy OfficeĪt 1200 rpm, Royal Purple oil was about 4.5% more fuel efficient than Shell Rotella 15W/40, and about 2.5% more efficient than Amsoil. Mechanical and Aerospace Engineering Department At fuel prices today, Rotella's cheap purchase price will be negated each time you fill up with fuel. Of 3 oils tested below, Rotella provided the worst fuel economy by up to 5%. The less wear and friction, the better performance and fuel economy you will get. **************************************************ĪERA/AERSCO (Engine Builders Association)ĭiesel engine oils produced before January 2007 had a CI-4 oil designation and offer higher levels of Zinc and wear preventive additives than passenger car oils.īUT, after January 2007, the CJ-4 oil designation for new truck engine manufacturers mandates oils with a reduction in Zinc.ĭo not break-in a flat tappet camshaft and lifters using Rotella T CJ-4 15w-40.Ī further point about how good a lubricant Rotella is. If you can get these pills, stock up, they cost about double what you pay for the cheap ass round.Here are some of my posts from these older threads. But that's what you get from tripping for 9 hours! Went to bed again and slept for another 4 hours.įeeling fine, just a little out of it. Slept for about 2 hours, got up, had something to eat. Here we go again I don't want this feeling to ever stop!Ħ:00 - Still rolling,eye wiggles have gone, and I can close my eyes had drift off. Just let it ripple though me.Ģ:00 - still going strong, eye wiggles not to bad, can at least focus on something.ģ:00 - took the last 1/4. I can stand and walk but I don't want to. I just don't get it, I'm so fucked, I can't even see properly, but he's working just fine.ġ2:00am - broke the pill in 4, and dropped 1/4.ġ2:20 - hit me like a tone of bricks. The little guy is up and ready for action. I can't tell how great this feels!ġ1:30 - The wife and I start to have a bit of fun. Seeing small distortions, like door handle moving, but not the melting affect you get from LSD. My eyes don't want to focus on anything for longer than 5 sec. Feeling great.ġ0:30 - Thought what the hell, and I dropped the other half.ġ0:50 - Holy shit! It hit me really hard. 9pm - took only half, the dealer warned me they where really strong.ĩ:30 - Starting to come up, nice and smooth.
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