Summary:
Engine : Toyota 1.8L 7AFE
Filter : Purolator PremiumPlus L14476 Date coded 1993
Fill Oil : Delo 400 15w-40 SL-grade
Sample Date: 12/12/2006
Total Miles: 157,056 miles
Interval : 4,196 miles
Duration : 83 days 9/08/06-12/12/06
Make-up Oil: 3 quarts of Chevron Supreme 5w-30 SM grade
Lube Control - LC20: 8oz on change, 12oz over interval
Blackstone Labs
Aluminum 2
Chromium 1
Iron 6
Copper 3
Lead 1
Tin 0
Molybdenum 236
Nickel 1
Manganese 0
Silver 0
Titanium 0
Potassium 0
Boron 28
Silicon 5
Sodium 3
Calcium 2922
Magnesium 11
Phosphorus 976
Zinc 1229
Barium 0
TBN: Not tested
Viscosity 66.1 Should be 68-78 per Blackstone for Delo 15w-40 FLAGGED
Flashpoint 390F Should be >390F FLAGGED
Fuel Trace Should be Water 0.0
Insolubles 0.5%
Blackstone commented about raising this interval. I had the interval cut short due to the cold weather that we had and I didn't want to run a 15w-40 under 10 degrees F otherwise I would have run this for double the interval. Blackstone didn't mention any issues with this interval other than the flagged viscosity and flashpoint.
I used Chevron Supreme 5w-30 as my make-up oil and I used 3 quarts of it which 3/4 qt. per 1,000 miles is my highest consumption rate yet when last time it was 1/2 qt. per 1,000 miles but that was also a thicker oil as well. It could be because of higher highway speed and I won't be concerned unless it reaches a rate higher than 1qt/1k.
I am currently trying an interval with Pennzoil Platinum 5w-30 for the winter and I think I will be using synthetic through the winter and sticking with conventional oil through the summer. How long do you think I should stretch this interval.
Does 10,000 miles sound reasonable? I am willing to take the risk of some extra wear for an interval as it seems that this engine really doesn't produce much of any wear at all.
What do you guys think?