'10 Jeep Wrangler-5w-30 Castrol Edge Bio-Synthetic, 5k

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2010 Jeep Wrangler 3.8 V6 No Make-up oil 52,000 on unit 5,000 on oil Castrol Edge Bio-Synthetic 5w-30 Baldwin BT223 Filter This is a nice report for your Wrangler. Metals are mostly steady compared to last time. The engine did put a little more copper in the mix, but certainly not a problem level. We expect some variation from sample to sample, just from normal variation in day-to-day use. The viscosity read in the 5W/20 range, but it's been that way before and doesn't look like a problem now. The oil wasn't thinned by fuel and no other contaminants showed up either. Oil filtration and combustion look great based on the low in-solubles. This Jeep is doing fine at 52,000 total miles. Aluminum 4 Chromium 1 Iron 8 Copper 21 Lead 0 Tin 0 Molybdenum 87 Nickel 0 Manganese 1 Silver 0 Titanium 9 Potassium 0 Boron 26 Silicon 12 Sodium 6 Calcium 1032 Magnesium 1150 Phosphorous 643 Zinc 863 Barium 0 SUS Viscosity @ 210F 49.1 CST Viscosity @100C 6.98 Flashpoint in F 420 Fuel % <0.5 Antifreeze % 0.0 Water % 0.0 Insolubles % 0.1 In- Fleetguard LF3339 (Oversized Filter) Pennzoil Platinum 0w-20- in Winter, single digits, doesn't sound so great at start-up. Purchased new in 7/2010- No problems with this engine, runs smooth and quiet, burns no oil, even up to 7k.
 
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Dec 4, 2004
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This is a 1st time where I encountered "Bio"-Synthetic oil. I don't know if it's the reason why this 30w sheared all the way down 6.98cst. But that number is a pretty thin 20W shear, inside a Blackstone report that did not flag dilution as the reason. Something is amiss here. Are you sure that this oil wasn't 5W20, instead of 5W30? Your add-pack numbers indicates a new brew. I thought these new-fangled SN Plus Dexos1/Gen2 oils don't shear as much anymore.
 

montero1

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Positive it was 5w30. I've had some past runs where a 5w30 ended up in the 7cst range. I'm really supposed to be running 5w20, per the manual. We'll see how the Pennzoil does for 5k or so.
 
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1/2 hr N.E. of Detroit
I wish stricter laws existed that forbid these oil makers from using super-wide ranges on the base oil brew and add-pack brew. Large variations occur and there's no one to stop these oil makers from bottling a 20w oil inside a 30W jug. But I suppose gasoline makers like BP do wide-wide variances with gas and get away with it, so why not oil too. Your oil didn't shear that much. It was sloppily bottled too thin..... my opinion. C'mon BP.
 
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