Hi, this is my first post.
All comments and questions are welcome. Please give me your input. I am striving for extended intervals but running into Fuel Dilution problems, and then severe oxidation, it seems.
Car: 2003 Toyota Celica GT-S, 2ZZ-GE.
Bought: 45,000 miles, 7/2007, 1 previous owner, leased.
Current Miles: 108,265
Average MPG: 30
Last MPG: 26.8 (gone down since SRI)
Max MPG: 36.23
--------------------------
History/Too much Info:
Ran Royal Purple 5w-30 since 50,000 miles, 9/18/2007. I was doing 3,000 - 5,000 oil change intervals in SLC, UT.
Switched to AMSOIL SSO 0W-30 at 85,571 on 2/7/2010, about a year after moving to PHX, AZ. Did a solvant-based(I think?) engine flush.
The #1 sample is my last Royal Purple. Subsequent samples are all AMSOIL.
Samples 1-3 are using WIX/MANN oil filters. Samples 4 and on are using the AMSOIL Absolute Efficiency Ea15K filter.
Spark plugs changed to NGK Iridium IX at 90,000 in an attempt to lower Fuel Dilution by ensuring more complete combustion. Compression test: 170 PSI dry, 220 Wet. Even across.
This is the original AMSOIL Signature Series formula, SSO with the AMSOIL 35,000 mile guarantee, before the reformulated Signature Series 0W-30 dropped to 25,000.
All samples should be with the WIX engine air filter changed every 12 months or about 12-15k miles. (Next samples will be with an Injen SRI and an AMSOIL Ea cone filter)
No oil consumption, at all.
--------------------------
I drive very hard, hitting 8,450 RPM more than once a week. Sometimes I drive like a granny though, nice and slow, economically.
I'm considering switching to AMSOIL's 5w-40 European formula...
Finally! I'll shut up now. Here's the results.
I tried making a Notepad by copying out of Excel, the top portion sucked and I gave up but oh well, the image should persist.
Code:
Oil Royal Purple AMSOIL SSO AMSOIL SSO AMSOIL SSO AMSOIL SSO
Weight 5w-30 0w-30 0w-30 0w-30 0w-30
Date Sampled 2/7/2010 5/8/2010 7/23/2010 1/3/2011 5/23/2011
Miles on Sample 5000 4875 5698 3771 4683
Miles on Car 85000 90446 96144 99916 104955
Iron.... 8 6 4 6 6
Chromium 0 0 0 0 0
Nickel.... 1 0 0 0 0
Aluminum 5 2 1 3 4
Copper.... 14 10 6 5 14
Lead.... 0 0 0 0 0
Tin...... 0 0 0 0 3
Cadmium.... 0 0 1 0 0
Silver.... 0 0 0 0 0
Vanadium 0 0 0 0 0
Silicon.... 15 10 4 15 10
Sodium.... 8 6 7 3 11
Potassium 1 1 2 4 2
Titanium 0 0 0 0 0
Molybdenum 122 15 3 1 3
Antimony 0 0 0 0 0
Manganese 0 0 0 11 20
Lithium.... 0 0 0 0 0
Boron.... 7 6 5 6 7
Magnesium 1111 110 20 15 29
Calcium.... 2082 3093 3642 3568 3069
Barium.... 0 0 0 0 0
Phosphorous 748 608 542 635 516
Zinc.... 848 659 600 713 595
Fuel Dilution % 2.9 2.2 1.2 2.1
Soot.... %
Water.... %
Viscosity@100C 8.7 9.7 9.9 9.4 10.4
Base Number 7.95 7.5 5.58 7.19 4.88
Oxidation 14 49 52 31 60
Nitration 21 24 26 19 25
Thanks for reading!!
All comments and questions are welcome. Please give me your input. I am striving for extended intervals but running into Fuel Dilution problems, and then severe oxidation, it seems.
Car: 2003 Toyota Celica GT-S, 2ZZ-GE.
Bought: 45,000 miles, 7/2007, 1 previous owner, leased.
Current Miles: 108,265
Average MPG: 30
Last MPG: 26.8 (gone down since SRI)
Max MPG: 36.23
--------------------------
History/Too much Info:
Ran Royal Purple 5w-30 since 50,000 miles, 9/18/2007. I was doing 3,000 - 5,000 oil change intervals in SLC, UT.
Switched to AMSOIL SSO 0W-30 at 85,571 on 2/7/2010, about a year after moving to PHX, AZ. Did a solvant-based(I think?) engine flush.
The #1 sample is my last Royal Purple. Subsequent samples are all AMSOIL.
Samples 1-3 are using WIX/MANN oil filters. Samples 4 and on are using the AMSOIL Absolute Efficiency Ea15K filter.
Spark plugs changed to NGK Iridium IX at 90,000 in an attempt to lower Fuel Dilution by ensuring more complete combustion. Compression test: 170 PSI dry, 220 Wet. Even across.
This is the original AMSOIL Signature Series formula, SSO with the AMSOIL 35,000 mile guarantee, before the reformulated Signature Series 0W-30 dropped to 25,000.
All samples should be with the WIX engine air filter changed every 12 months or about 12-15k miles. (Next samples will be with an Injen SRI and an AMSOIL Ea cone filter)
No oil consumption, at all.
--------------------------
I drive very hard, hitting 8,450 RPM more than once a week. Sometimes I drive like a granny though, nice and slow, economically.
I'm considering switching to AMSOIL's 5w-40 European formula...
Finally! I'll shut up now. Here's the results.

I tried making a Notepad by copying out of Excel, the top portion sucked and I gave up but oh well, the image should persist.
Code:
Oil Royal Purple AMSOIL SSO AMSOIL SSO AMSOIL SSO AMSOIL SSO
Weight 5w-30 0w-30 0w-30 0w-30 0w-30
Date Sampled 2/7/2010 5/8/2010 7/23/2010 1/3/2011 5/23/2011
Miles on Sample 5000 4875 5698 3771 4683
Miles on Car 85000 90446 96144 99916 104955
Iron.... 8 6 4 6 6
Chromium 0 0 0 0 0
Nickel.... 1 0 0 0 0
Aluminum 5 2 1 3 4
Copper.... 14 10 6 5 14
Lead.... 0 0 0 0 0
Tin...... 0 0 0 0 3
Cadmium.... 0 0 1 0 0
Silver.... 0 0 0 0 0
Vanadium 0 0 0 0 0
Silicon.... 15 10 4 15 10
Sodium.... 8 6 7 3 11
Potassium 1 1 2 4 2
Titanium 0 0 0 0 0
Molybdenum 122 15 3 1 3
Antimony 0 0 0 0 0
Manganese 0 0 0 11 20
Lithium.... 0 0 0 0 0
Boron.... 7 6 5 6 7
Magnesium 1111 110 20 15 29
Calcium.... 2082 3093 3642 3568 3069
Barium.... 0 0 0 0 0
Phosphorous 748 608 542 635 516
Zinc.... 848 659 600 713 595
Fuel Dilution % 2.9 2.2 1.2 2.1
Soot.... %
Water.... %
Viscosity@100C 8.7 9.7 9.9 9.4 10.4
Base Number 7.95 7.5 5.58 7.19 4.88
Oxidation 14 49 52 31 60
Nitration 21 24 26 19 25
Thanks for reading!!