All,
On the 'Annual Oil Change Y/N' thread, the question was asked to show some results of extended drain intervals and wear. I've pulled these oil analysis results off threads on Bob's the Oil Guy's oil analysis page. I've preferentially listed AMSOIL results (okay, I'm partial to AMSOIL for some reason). The first two are AMSOIL Series 2000 0w30, the second two AMSOIL SAE 5w30. Both meet GM Spec 4718M for the LS1/LS6 motor.
There are about a 1000 oil analysis results from all sorts of oils on his site if you are interested. I do not have first hand knowledge of any of these. I looked through about 20 pages and couldn't find any applicable Corvette tests. There is one guy running RP Racing Oil in a Z06 which shows mixed results and as far as I can tell this oil doesn't meet OEM requirements.
Note the low copper and iron on these which are normally associated with wear products.
Also note that engine oils typically use antiwear (AW) additives to prevent metal-to-metal contact within an engine. These are commonly zinc and phosphorus compounds (zinc dithiophosphate or ZDP).
The point to take from this is that all of these cars are doing just fine with oil change intervals longer than 3-months/3,000-miles.
TEST 1:
AMSOIL Series 2000 0w30 (TSO)
AMSOIL SDF filter
2004 Honda Accord 2.4 VTEC
12,589 miles on oil
49,273 miles on engine
"Some background: 2004 Honda Accord w/ the 2.4 VTEC engine, purchased new in Nov. 2003. He is in sales, and the car averages about 1,000 miles per week.
The car has used Amsoil since approx. the 17,000 mile mark, but this is the first analysis. For this analysis, the oil (Series 2000 0w30) had 12,589 miles & an Amsoil filter was used. The car had a total of 49,273 when sampled on 11/18. Impressively, it required zero added oil for the 12,589 miles. Blackstone did the analysis.
Results posted as -- 04 Accord / Universal Avg
Aluminum 2/4
Chromium 1/1
Iron 9/10
Copper 1/3
Lead 0/3
Tin 1/1
Moly 4/95
Nickel 0/0
Manganese 0/3
Silver 0/0
Titanium 0/0
Potassium 0/1
Boron 27/68
Silicon 8/13
Sodium 8/13
Calcium 3051/2714
Magnesium 1061/64
Phosphorus 1101/759
Zinc 1479/896
Barium 0/0
Viscosity 73.5/ 56-64
Flashpoint 410/>365
Fule <0.5/<2.0
Antifreeze 0/0
Water 0/0
Insolubles 0.2/<0.6
TBN 3.2
TEST 2:
AMSOIL Series 2000 0w30 (TSO)
OEM filter
2000 Audi S4, 2.7 V6 BiTurbo
7,658 miles on oil
40,618 miles on engine
"Amsoil 0W-30
7,658 on oil, no make up oil added
2000 Audi S4, 2.7 V6 BiTurbo
Miles on Oil 7658
Miles on Engine 40618
Sample Date 11/28/2004, last oil change April 10th, 2004.
ALUMINUM 3
CHROMIUM 1
IRON 13
COPPER 6
LEAD 0
TIN 0
MOLYBDENUM 2
NICKEL 0
MANGANESE 0
SILVER 0
TITANIUM 0
POTASSIUM 0
BORON 23
SILICON 11
SODIUM 2
CALCIUM 2194
MAGNESIUM 742
PHOSPHORUS 936
ZINC 1134
BARIUM 0
Avg to hard driver, sample included Track event in April, where oil temp reached 280 degrees and several spririted drives, where temps reached 270 degrees. Home-work traffic is less than 15 miles two ways, however, engine gets regular work out during weekends. "
TEST 3:
AMSOIL 5w30 (ASL)
AMSOIL SDF Filter
2000 Honda Accord 2.3L
4,697 miles on oil
81,398 miles on engine
"This analysis is on my daughter's 2000 Honda Accord 2.3l 4 cylinder. Car was purchased used w/ 73,000 miles or so, and now has 81,398. Past maintenance is unknown, but a peak inside the valve cover seems to show "okay" oil change intervals.
Oil is Amsoil 5w30 w/ Amsoil's filter. Oil was ran for 4,697 miles. About 1 pint of make up oil was added. Results are from Blackstone:
Listed as: 00 Accord / Universal Averages
Alum 2/3
Chrom 0/1
Iron 4/8
Copper 3/5
Lead 1/6
Tin 0/1
Moly 0/59
Nickel 0/0
Mangan 0/0
Silver 0/0
Ttanium 0/0
Potassium 0/1
Boron 27/64
Silicon 3/12
Sodium 1/7
Calcium 1680/2199
Magnesium 442/263
Ohosp 759/774
Zinc 892/920
Barium 0/0
Sub viscosity @ 210 63.8/56-63
Flashpoint 400/>365
Fuel <0.5/<2.0
Antifreeze 0/0
Water 0/<0.1
Insolubles 0.4/<0.6
TBN 6.2"
Test 4:
AMSOIL 5w30 (ASL)
Filter ???
BMW 740iL
4,400 miles on oil
91,246 miles on engine
"Purchased the BMW used with about 68,000 miles. Used Mobil 1 5W/30 for first two oil changes. Before switch to Amsoil had 14410 miles with Mobil 1. Current UOA with Amsoil 5W/30, will be switching to GC 0W/30 next because of interest on site. And I have 16 bottles in my shed.
Make-up oil Zero.
Comments: Looks like you bought yourself a nice one. The univ avg col shows typical wear from this type of engine after 5700 miles on the oil. Your oil was in use 4400 miles, and wear levels all were much lower than averages, showing a well-wearing engine that has been nicely maintained. We're glad to see you haven't changed out the oil yet, because it has a lot of good life remaining. Try adding 3000 miles to this fill, then check back. You might not even to change it at that point.
Miles on unit. 91246
Unit/location Avg --- Univ Avg
Al 2/6
Chro 0/1
Iron 4/10
Cop 5/7
Lead 5/9
Tin 3/2
Moly 12/101
Nick 0/1
Mang 0/1
Sil 0/0
Titanium 0/0
Potassium 0/1
Boron 70/36
Silicon 6/8
Sodium 2/4
Calcium 2202/2587
Mag 623/239
Phos 926/797
Zinc 1150/977
Barium 0/0
Test Values should be Tested Values Were
Viscosity 56-68 65.1
Flashpoint >365 360
Fuel <2.0 <0.5
Insolubles <0.6 0.4
antifreeze 0 0
Water 0 0 "
